0=x^3-2x^2-8x

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Solution for 0=x^3-2x^2-8x equation:


Simplifying
0 = x3 + -2x2 + -8x

Reorder the terms:
0 = -8x + -2x2 + x3

Solving
0 = -8x + -2x2 + x3

Solving for variable 'x'.
Remove the zero:
8x + 2x2 + -1x3 = -8x + -2x2 + x3 + 8x + 2x2 + -1x3

Reorder the terms:
8x + 2x2 + -1x3 = -8x + 8x + -2x2 + 2x2 + x3 + -1x3

Combine like terms: -8x + 8x = 0
8x + 2x2 + -1x3 = 0 + -2x2 + 2x2 + x3 + -1x3
8x + 2x2 + -1x3 = -2x2 + 2x2 + x3 + -1x3

Combine like terms: -2x2 + 2x2 = 0
8x + 2x2 + -1x3 = 0 + x3 + -1x3
8x + 2x2 + -1x3 = x3 + -1x3

Combine like terms: x3 + -1x3 = 0
8x + 2x2 + -1x3 = 0

Factor out the Greatest Common Factor (GCF), 'x'.
x(8 + 2x + -1x2) = 0

Factor a trinomial.
x((4 + -1x)(2 + x)) = 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 '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Solution

x = {0, 4, -2}

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