3x^2=81-18x

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


Simplifying
3x2 = 81 + -18x

Solving
3x2 = 81 + -18x

Solving for variable 'x'.

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

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

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

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

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

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

Ignore the factor 3.

Subproblem 1

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 2

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 = {-9, 3}

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