x^2+9x=-9x-81

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


Simplifying
x2 + 9x = -9x + -81

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

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

Solving
9x + x2 = -81 + -9x

Solving for variable 'x'.

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

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

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

Combine like terms: -81 + 81 = 0
81 + 18x + x2 = 0 + -9x + 9x
81 + 18x + x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
81 + 18x + x2 = 0

Factor a trinomial.
(9 + x)(9 + x) = 0

Subproblem 1

Set the factor '(9 + x)' equal to zero and attempt to solve: Simplifying 9 + x = 0 Solving 9 + x = 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 + x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x = 0 + -9 x = 0 + -9 Combine like terms: 0 + -9 = -9 x = -9 Simplifying x = -9

Subproblem 2

Set the factor '(9 + x)' equal to zero and attempt to solve: Simplifying 9 + x = 0 Solving 9 + x = 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 + x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x = 0 + -9 x = 0 + -9 Combine like terms: 0 + -9 = -9 x = -9 Simplifying x = -9

Solution

x = {-9, -9}

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