x^3=9x^2-20x

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Solution for x^3=9x^2-20x equation:


Simplifying
x3 = 9x2 + -20x

Reorder the terms:
x3 = -20x + 9x2

Solving
x3 = -20x + 9x2

Solving for variable 'x'.

Reorder the terms:
20x + -9x2 + x3 = -20x + 9x2 + 20x + -9x2

Reorder the terms:
20x + -9x2 + x3 = -20x + 20x + 9x2 + -9x2

Combine like terms: -20x + 20x = 0
20x + -9x2 + x3 = 0 + 9x2 + -9x2
20x + -9x2 + x3 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
20x + -9x2 + x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(20 + -9x + x2) = 0

Factor a trinomial.
x((4 + -1x)(5 + -1x)) = 0

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Subproblem 3

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {0, 4, 5}

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