Let us consider the cubic function f(x) = (x+20)(x+20)(x+20) = x^{3} + 60x^{2} + 1200x + 8000. We will inspect the graph, the zeroes, the turning and inflection points in the cubic curve curve y = f(x).
Cubic Polynomials and Equations
A cubic polynomial is a polynomial of degree 3. where a is nonzero. An equation involving a cubic polynomial is called a cubic equation and is of the form f(x) = 0. There is also a closedform solution known as the cubic formula which exists for the solutions of an arbitrary cubic equation. A cubic polynomial is represented by a function of the form. And f(x) = 0 is a cubic equation. The points at which this curve cuts the Xaxis are the roots of the equation.
Graph of y = f(x) = (x+20)(x+20)(x+20) = x^{3} + 60x^{2} + 1200x + 8000 A few computed points on the curve, apart from the zero(s) which are known: (21,1), (18,8), (15,125)
If the given cubic function is: f(x) = ax^{3 }+ bx^{2 }+ cx + d The derivative of this function is: f'(x) = 3ax^{2} + 2bx + cThe function given to us us f(x) = (x+20)(x+20)(x+20) = x^{3} + 60x^{2} + 1200x + 8000 And the derivative for this is f'(x) = 3x^{2} + 120x + 1
Consider the cubic equation f(x) = (x+20)(x+20)(x+20) = x^{3} + 60x^{2} + 1200x + 8000 = 0 The roots of this cubic equation are at: (x  (20)) = 0 => x = 20, OR (x  (20)) = 0 => x = 20, OR (x  (20)) = 0 => x =20 This cubic equation has a triple root at x = 20. So the plotted cubic curve has not only a zero for that value of x, but the derivative and second derivative at the point are also zero.
The turning or stationary points is where f'(x) = 0 => 3x^{2} + 120x + 1 = 0 => x = 20.0, x = 20.0 These are also called the "critical" points where the derivative is zero. Coming to other geometrical features of this curve: What we see here is the graph of a nonlinear function. The yintercept of this curve is at y=8000. And the second derivative of this curve becomes zero at x = 20.0. At this point the curve changes concavity. A cubic curve has point symmetry around the point of inflection or inflexion. These are just some of the important features and aspects to keep in mind while trying to visualize and analyze a plot of an algebraic function. A graphical and visual inspection helps in several ways.
The zeroes of a polynomial, if they are known, and the coefficients of that polynomial are two different sets of numbers that have interesting relations. If we know the zeroes, then we can write down algebraic expressions for the coefficients. Going the other way is much harder and cannot be done in general. A cubic function has a bit more variety in its shape than the quadratic polynomials which are always parabolas. We can get a lot of information from the factorization of a cubic function. We get a fairly generic cubic shape when we have three distinct linear factors
Check the plot of another cubic curve here with roots at 17, 20, 20
Here's another cubic curve here with roots at 20, 10, 20
Here's another cubic curve here with roots at 20, 20, 14 Many of these concepts are a part of the Grade 9,10,11,12 (High School) Mathematics syllabus of the UK GCSE/GCE curriculum, Common Core Standards in the US, ICSE/CBSE/SSC/NTSE syllabus in Indian high schools. You may check out our free and printable worksheets for Common Core and GCSE.
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Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (4,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (4,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (4,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (4,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,20,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,0,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (7,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,20,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,0,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (10,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,20,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,0,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (13,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,20,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,0,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (16,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,20,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,0,16)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,20)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,14)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,8)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,2)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,4)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,10)
Graph plot of Cubic Polynomial Function Curve/Cubic Equation for zeros, roots (19,10,16) 
