3x^3+18x^2=81x

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Solution for 3x^3+18x^2=81x equation:


Simplifying
3x3 + 18x2 = 81x

Reorder the terms:
18x2 + 3x3 = 81x

Solving
18x2 + 3x3 = 81x

Solving for variable 'x'.

Reorder the terms:
-81x + 18x2 + 3x3 = 81x + -81x

Combine like terms: 81x + -81x = 0
-81x + 18x2 + 3x3 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-27 + 6x + x2) = 0

Factor a trinomial.
3x((-9 + -1x)(3 + -1x)) = 0

Ignore the factor 3.

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 '(-9 + -1x)' equal to zero and attempt to solve: Simplifying -9 + -1x = 0 Solving -9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9

Subproblem 3

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {0, -9, 3}

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