(x-4)(x+8)+20=0

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Solution for (x-4)(x+8)+20=0 equation:


Simplifying
(x + -4)(x + 8) + 20 = 0

Reorder the terms:
(-4 + x)(x + 8) + 20 = 0

Reorder the terms:
(-4 + x)(8 + x) + 20 = 0

Multiply (-4 + x) * (8 + x)
(-4(8 + x) + x(8 + x)) + 20 = 0
((8 * -4 + x * -4) + x(8 + x)) + 20 = 0
((-32 + -4x) + x(8 + x)) + 20 = 0
(-32 + -4x + (8 * x + x * x)) + 20 = 0
(-32 + -4x + (8x + x2)) + 20 = 0

Combine like terms: -4x + 8x = 4x
(-32 + 4x + x2) + 20 = 0

Reorder the terms:
-32 + 20 + 4x + x2 = 0

Combine like terms: -32 + 20 = -12
-12 + 4x + x2 = 0

Solving
-12 + 4x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-6 + -1x)(2 + -1x) = 0

Subproblem 1

Set the factor '(-6 + -1x)' equal to zero and attempt to solve: Simplifying -6 + -1x = 0 Solving -6 + -1x = 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 + -1x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -1x = 0 + 6 -1x = 0 + 6 Combine like terms: 0 + 6 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6

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 = {-6, 2}

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