(x-2)(x+4)+6(x+2)(x-2)=x^2-4

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Solution for (x-2)(x+4)+6(x+2)(x-2)=x^2-4 equation:


Simplifying
(x + -2)(x + 4) + 6(x + 2)(x + -2) = x2 + -4

Reorder the terms:
(-2 + x)(x + 4) + 6(x + 2)(x + -2) = x2 + -4

Reorder the terms:
(-2 + x)(4 + x) + 6(x + 2)(x + -2) = x2 + -4

Multiply (-2 + x) * (4 + x)
(-2(4 + x) + x(4 + x)) + 6(x + 2)(x + -2) = x2 + -4
((4 * -2 + x * -2) + x(4 + x)) + 6(x + 2)(x + -2) = x2 + -4
((-8 + -2x) + x(4 + x)) + 6(x + 2)(x + -2) = x2 + -4
(-8 + -2x + (4 * x + x * x)) + 6(x + 2)(x + -2) = x2 + -4
(-8 + -2x + (4x + x2)) + 6(x + 2)(x + -2) = x2 + -4

Combine like terms: -2x + 4x = 2x
(-8 + 2x + x2) + 6(x + 2)(x + -2) = x2 + -4

Reorder the terms:
-8 + 2x + x2 + 6(2 + x)(x + -2) = x2 + -4

Reorder the terms:
-8 + 2x + x2 + 6(2 + x)(-2 + x) = x2 + -4

Multiply (2 + x) * (-2 + x)
-8 + 2x + x2 + 6(2(-2 + x) + x(-2 + x)) = x2 + -4
-8 + 2x + x2 + 6((-2 * 2 + x * 2) + x(-2 + x)) = x2 + -4
-8 + 2x + x2 + 6((-4 + 2x) + x(-2 + x)) = x2 + -4
-8 + 2x + x2 + 6(-4 + 2x + (-2 * x + x * x)) = x2 + -4
-8 + 2x + x2 + 6(-4 + 2x + (-2x + x2)) = x2 + -4

Combine like terms: 2x + -2x = 0
-8 + 2x + x2 + 6(-4 + 0 + x2) = x2 + -4
-8 + 2x + x2 + 6(-4 + x2) = x2 + -4
-8 + 2x + x2 + (-4 * 6 + x2 * 6) = x2 + -4
-8 + 2x + x2 + (-24 + 6x2) = x2 + -4

Reorder the terms:
-8 + -24 + 2x + x2 + 6x2 = x2 + -4

Combine like terms: -8 + -24 = -32
-32 + 2x + x2 + 6x2 = x2 + -4

Combine like terms: x2 + 6x2 = 7x2
-32 + 2x + 7x2 = x2 + -4

Reorder the terms:
-32 + 2x + 7x2 = -4 + x2

Solving
-32 + 2x + 7x2 = -4 + x2

Solving for variable 'x'.

Reorder the terms:
-32 + 4 + 2x + 7x2 + -1x2 = -4 + x2 + 4 + -1x2

Combine like terms: -32 + 4 = -28
-28 + 2x + 7x2 + -1x2 = -4 + x2 + 4 + -1x2

Combine like terms: 7x2 + -1x2 = 6x2
-28 + 2x + 6x2 = -4 + x2 + 4 + -1x2

Reorder the terms:
-28 + 2x + 6x2 = -4 + 4 + x2 + -1x2

Combine like terms: -4 + 4 = 0
-28 + 2x + 6x2 = 0 + x2 + -1x2
-28 + 2x + 6x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-28 + 2x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-14 + x + 3x2) = 0

Factor a trinomial.
2((-7 + -3x)(2 + -1x)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-7 + -3x)' equal to zero and attempt to solve: Simplifying -7 + -3x = 0 Solving -7 + -3x = 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 + -3x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -3x = 0 + 7 -3x = 0 + 7 Combine like terms: 0 + 7 = 7 -3x = 7 Divide each side by '-3'. x = -2.333333333 Simplifying x = -2.333333333

Subproblem 2

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

Solution

x = {-2.333333333, 2}

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