8(x+5)(x-4)=0

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Solution for 8(x+5)(x-4)=0 equation: 


Simplifying
8(x + 5)(x + -4) = 0

Reorder the terms:
8(5 + x)(x + -4) = 0

Reorder the terms:
8(5 + x)(-4 + x) = 0

Multiply (5 + x) * (-4 + x)
8(5(-4 + x) + x(-4 + x)) = 0
8((-4 * 5 + x * 5) + x(-4 + x)) = 0
8((-20 + 5x) + x(-4 + x)) = 0
8(-20 + 5x + (-4 * x + x * x)) = 0
8(-20 + 5x + (-4x + x2)) = 0

Combine like terms: 5x + -4x = 1x
8(-20 + 1x + x2) = 0
(-20 * 8 + 1x * 8 + x2 * 8) = 0
(-160 + 8x + 8x2) = 0

Solving
-160 + 8x + 8x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '8'.
8(-20 + x + x2) = 0

Factor a trinomial.
8((-5 + -1x)(4 + -1x)) = 0

Ignore the factor 8.

Subproblem 1
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

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 = {-5, 4}

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