0=x^3+9x^2+20x

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Solution for 0=x^3+9x^2+20x equation:


Simplifying
0 = x3 + 9x2 + 20x

Reorder the terms:
0 = 20x + 9x2 + x3

Solving
0 = 20x + 9x2 + x3

Solving for variable 'x'.
Remove the zero:
-20x + -9x2 + -1x3 = 20x + 9x2 + x3 + -20x + -9x2 + -1x3

Reorder the terms:
-20x + -9x2 + -1x3 = 20x + -20x + 9x2 + -9x2 + x3 + -1x3

Combine like terms: 20x + -20x = 0
-20x + -9x2 + -1x3 = 0 + 9x2 + -9x2 + x3 + -1x3
-20x + -9x2 + -1x3 = 9x2 + -9x2 + x3 + -1x3

Combine like terms: 9x2 + -9x2 = 0
-20x + -9x2 + -1x3 = 0 + x3 + -1x3
-20x + -9x2 + -1x3 = x3 + -1x3

Combine like terms: x3 + -1x3 = 0
-20x + -9x2 + -1x3 = 0

Factor out the Greatest Common Factor (GCF), '-1x'.
-1x(20 + 9x + x2) = 0

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

Ignore the factor -1.

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 '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 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 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5

Subproblem 3

Set the factor '(4 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 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 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4

Solution

x = {0, -5, -4}

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