(x+2)(x-2)=(2x+9)(x-2)

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Solution for (x+2)(x-2)=(2x+9)(x-2) equation: 


Simplifying
(x + 2)(x + -2) = (2x + 9)(x + -2)

Reorder the terms:
(2 + x)(x + -2) = (2x + 9)(x + -2)

Reorder the terms:
(2 + x)(-2 + x) = (2x + 9)(x + -2)

Multiply (2 + x) * (-2 + x)
(2(-2 + x) + x(-2 + x)) = (2x + 9)(x + -2)
((-2 * 2 + x * 2) + x(-2 + x)) = (2x + 9)(x + -2)
((-4 + 2x) + x(-2 + x)) = (2x + 9)(x + -2)
(-4 + 2x + (-2 * x + x * x)) = (2x + 9)(x + -2)
(-4 + 2x + (-2x + x2)) = (2x + 9)(x + -2)

Combine like terms: 2x + -2x = 0
(-4 + 0 + x2) = (2x + 9)(x + -2)
(-4 + x2) = (2x + 9)(x + -2)

Reorder the terms:
-4 + x2 = (9 + 2x)(x + -2)

Reorder the terms:
-4 + x2 = (9 + 2x)(-2 + x)

Multiply (9 + 2x) * (-2 + x)
-4 + x2 = (9(-2 + x) + 2x * (-2 + x))
-4 + x2 = ((-2 * 9 + x * 9) + 2x * (-2 + x))
-4 + x2 = ((-18 + 9x) + 2x * (-2 + x))
-4 + x2 = (-18 + 9x + (-2 * 2x + x * 2x))
-4 + x2 = (-18 + 9x + (-4x + 2x2))

Combine like terms: 9x + -4x = 5x
-4 + x2 = (-18 + 5x + 2x2)

Solving
-4 + x2 = -18 + 5x + 2x2

Solving for variable 'x'.

Reorder the terms:
-4 + 18 + -5x + x2 + -2x2 = -18 + 5x + 2x2 + 18 + -5x + -2x2

Combine like terms: -4 + 18 = 14
14 + -5x + x2 + -2x2 = -18 + 5x + 2x2 + 18 + -5x + -2x2

Combine like terms: x2 + -2x2 = -1x2
14 + -5x + -1x2 = -18 + 5x + 2x2 + 18 + -5x + -2x2

Reorder the terms:
14 + -5x + -1x2 = -18 + 18 + 5x + -5x + 2x2 + -2x2

Combine like terms: -18 + 18 = 0
14 + -5x + -1x2 = 0 + 5x + -5x + 2x2 + -2x2
14 + -5x + -1x2 = 5x + -5x + 2x2 + -2x2

Combine like terms: 5x + -5x = 0
14 + -5x + -1x2 = 0 + 2x2 + -2x2
14 + -5x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
14 + -5x + -1x2 = 0

Factor a trinomial.
(2 + -1x)(7 + x) = 0


Subproblem 1
Set the factor '(2 + -1x)' equal to zero and attempt to solve:

Simplifying
2 + -1x = 0

Solving
2 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + -1x = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1x = 0 + -2
-1x = 0 + -2

Combine like terms: 0 + -2 = -2
-1x = -2

Divide each side by '-1'.
x = 2

Simplifying
x = 2

Subproblem 2
Set the factor '(7 + x)' equal to zero and attempt to solve:

Simplifying
7 + x = 0

Solving
7 + x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + -7 + x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + x = 0 + -7
x = 0 + -7

Combine like terms: 0 + -7 = -7
x = -7

Simplifying
x = -7
Solution
x = {2, -7}

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