(x+8)(x-4)=

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


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

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

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

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

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

Solving
-32 + 4x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-8 + -1x)(4 + -1x) = 0


Subproblem 1
Set the factor '(-8 + -1x)' equal to zero and attempt to solve:

Simplifying
-8 + -1x = 0

Solving
-8 + -1x = 0

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

Add '8' to each side of the equation.
-8 + 8 + -1x = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -1x = 0 + 8
-1x = 0 + 8

Combine like terms: 0 + 8 = 8
-1x = 8

Divide each side by '-1'.
x = -8

Simplifying
x = -8

Subproblem 2
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {-8, 4}

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