8x^2-16x-18=6x^2

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Solution for 8x^2-16x-18=6x^2 equation:


Simplifying
8x2 + -16x + -18 = 6x2

Reorder the terms:
-18 + -16x + 8x2 = 6x2

Solving
-18 + -16x + 8x2 = 6x2

Solving for variable 'x'.

Combine like terms: 8x2 + -6x2 = 2x2
-18 + -16x + 2x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
-18 + -16x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-9 + -8x + x2) = 0

Factor a trinomial.
2((-1 + -1x)(9 + -1x)) = 0

Ignore the factor 2.

Subproblem 1

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

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

Solution

x = {-1, 9}

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