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

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


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

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

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

Multiply (-4 + 5x) * (8 + 4x)
(-4(8 + 4x) + 5x * (8 + 4x)) = 0
((8 * -4 + 4x * -4) + 5x * (8 + 4x)) = 0
((-32 + -16x) + 5x * (8 + 4x)) = 0
(-32 + -16x + (8 * 5x + 4x * 5x)) = 0
(-32 + -16x + (40x + 20x2)) = 0

Combine like terms: -16x + 40x = 24x
(-32 + 24x + 20x2) = 0

Solving
-32 + 24x + 20x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-8 + 6x + 5x2) = 0

Factor a trinomial.
4((-2 + -1x)(4 + -5x)) = 0

Ignore the factor 4.

Subproblem 1
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

Subproblem 2
Set the factor '(4 + -5x)' equal to zero and attempt to solve:

Simplifying
4 + -5x = 0

Solving
4 + -5x = 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 + -5x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -5x = 0 + -4
-5x = 0 + -4

Combine like terms: 0 + -4 = -4
-5x = -4

Divide each side by '-5'.
x = 0.8

Simplifying
x = 0.8
Solution
x = {-2, 0.8}

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