8x^2-9x-11=9x^2+7

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Solution for 8x^2-9x-11=9x^2+7 equation:


Simplifying
8x2 + -9x + -11 = 9x2 + 7

Reorder the terms:
-11 + -9x + 8x2 = 9x2 + 7

Reorder the terms:
-11 + -9x + 8x2 = 7 + 9x2

Solving
-11 + -9x + 8x2 = 7 + 9x2

Solving for variable 'x'.

Reorder the terms:
-11 + -7 + -9x + 8x2 + -9x2 = 7 + 9x2 + -7 + -9x2

Combine like terms: -11 + -7 = -18
-18 + -9x + 8x2 + -9x2 = 7 + 9x2 + -7 + -9x2

Combine like terms: 8x2 + -9x2 = -1x2
-18 + -9x + -1x2 = 7 + 9x2 + -7 + -9x2

Reorder the terms:
-18 + -9x + -1x2 = 7 + -7 + 9x2 + -9x2

Combine like terms: 7 + -7 = 0
-18 + -9x + -1x2 = 0 + 9x2 + -9x2
-18 + -9x + -1x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
-18 + -9x + -1x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(18 + 9x + x2) = 0

Factor a trinomial.
-1((6 + x)(3 + x)) = 0

Ignore the factor -1.

Subproblem 1

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

Subproblem 2

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 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 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Solution

x = {-6, -3}

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