(x-4)(x+8)=13

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Solution for (x-4)(x+8)=13 equation:


Simplifying
(x + -4)(x + 8) = 13

Reorder the terms:
(-4 + x)(x + 8) = 13

Reorder the terms:
(-4 + x)(8 + x) = 13

Multiply (-4 + x) * (8 + x)
(-4(8 + x) + x(8 + x)) = 13
((8 * -4 + x * -4) + x(8 + x)) = 13
((-32 + -4x) + x(8 + x)) = 13
(-32 + -4x + (8 * x + x * x)) = 13
(-32 + -4x + (8x + x2)) = 13

Combine like terms: -4x + 8x = 4x
(-32 + 4x + x2) = 13

Solving
-32 + 4x + x2 = 13

Solving for variable 'x'.

Reorder the terms:
-32 + -13 + 4x + x2 = 13 + -13

Combine like terms: -32 + -13 = -45
-45 + 4x + x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-45 + 4x + x2 = 0

Factor a trinomial.
(-9 + -1x)(5 + -1x) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {-9, 5}

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