(x-1)(x+2)-(x+2)(3x+8)=0

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Solution for (x-1)(x+2)-(x+2)(3x+8)=0 equation:


Simplifying
(x + -1)(x + 2) + -1(x + 2)(3x + 8) = 0

Reorder the terms:
(-1 + x)(x + 2) + -1(x + 2)(3x + 8) = 0

Reorder the terms:
(-1 + x)(2 + x) + -1(x + 2)(3x + 8) = 0

Multiply (-1 + x) * (2 + x)
(-1(2 + x) + x(2 + x)) + -1(x + 2)(3x + 8) = 0
((2 * -1 + x * -1) + x(2 + x)) + -1(x + 2)(3x + 8) = 0
((-2 + -1x) + x(2 + x)) + -1(x + 2)(3x + 8) = 0
(-2 + -1x + (2 * x + x * x)) + -1(x + 2)(3x + 8) = 0
(-2 + -1x + (2x + x2)) + -1(x + 2)(3x + 8) = 0

Combine like terms: -1x + 2x = 1x
(-2 + 1x + x2) + -1(x + 2)(3x + 8) = 0

Reorder the terms:
-2 + 1x + x2 + -1(2 + x)(3x + 8) = 0

Reorder the terms:
-2 + 1x + x2 + -1(2 + x)(8 + 3x) = 0

Multiply (2 + x) * (8 + 3x)
-2 + 1x + x2 + -1(2(8 + 3x) + x(8 + 3x)) = 0
-2 + 1x + x2 + -1((8 * 2 + 3x * 2) + x(8 + 3x)) = 0
-2 + 1x + x2 + -1((16 + 6x) + x(8 + 3x)) = 0
-2 + 1x + x2 + -1(16 + 6x + (8 * x + 3x * x)) = 0
-2 + 1x + x2 + -1(16 + 6x + (8x + 3x2)) = 0

Combine like terms: 6x + 8x = 14x
-2 + 1x + x2 + -1(16 + 14x + 3x2) = 0
-2 + 1x + x2 + (16 * -1 + 14x * -1 + 3x2 * -1) = 0
-2 + 1x + x2 + (-16 + -14x + -3x2) = 0

Reorder the terms:
-2 + -16 + 1x + -14x + x2 + -3x2 = 0

Combine like terms: -2 + -16 = -18
-18 + 1x + -14x + x2 + -3x2 = 0

Combine like terms: 1x + -14x = -13x
-18 + -13x + x2 + -3x2 = 0

Combine like terms: x2 + -3x2 = -2x2
-18 + -13x + -2x2 = 0

Solving
-18 + -13x + -2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(18 + 13x + 2x2) = 0

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

Ignore the factor -1.

Subproblem 1

Set the factor '(9 + 2x)' equal to zero and attempt to solve: Simplifying 9 + 2x = 0 Solving 9 + 2x = 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 + 2x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 0 + -9 2x = 0 + -9 Combine like terms: 0 + -9 = -9 2x = -9 Divide each side by '2'. x = -4.5 Simplifying x = -4.5

Subproblem 2

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 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 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Solution

x = {-4.5, -2}

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