x^2+18x+81=9

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Solution for x^2+18x+81=9 equation:


Simplifying
x2 + 18x + 81 = 9

Reorder the terms:
81 + 18x + x2 = 9

Solving
81 + 18x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
81 + -9 + 18x + x2 = 9 + -9

Combine like terms: 81 + -9 = 72
72 + 18x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
72 + 18x + x2 = 0

Factor a trinomial.
(12 + x)(6 + x) = 0

Subproblem 1

Set the factor '(12 + x)' equal to zero and attempt to solve: Simplifying 12 + x = 0 Solving 12 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + x = 0 + -12 x = 0 + -12 Combine like terms: 0 + -12 = -12 x = -12 Simplifying x = -12

Subproblem 2

Set the factor '(6 + x)' equal to zero and attempt to solve: Simplifying 6 + x = 0 Solving 6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + x = 0 + -6 x = 0 + -6 Combine like terms: 0 + -6 = -6 x = -6 Simplifying x = -6

Solution

x = {-12, -6}

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