(4x+5)(-2x+8)=0

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Solution for (4x+5)(-2x+8)=0 equation: 


Simplifying
(4x + 5)(-2x + 8) = 0

Reorder the terms:
(5 + 4x)(-2x + 8) = 0

Reorder the terms:
(5 + 4x)(8 + -2x) = 0

Multiply (5 + 4x) * (8 + -2x)
(5(8 + -2x) + 4x * (8 + -2x)) = 0
((8 * 5 + -2x * 5) + 4x * (8 + -2x)) = 0
((40 + -10x) + 4x * (8 + -2x)) = 0
(40 + -10x + (8 * 4x + -2x * 4x)) = 0
(40 + -10x + (32x + -8x2)) = 0

Combine like terms: -10x + 32x = 22x
(40 + 22x + -8x2) = 0

Solving
40 + 22x + -8x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(20 + 11x + -4x2) = 0

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

Ignore the factor 2.

Subproblem 1
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

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

Simplifying
5 + 4x = 0

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

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

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

Divide each side by '4'.
x = -1.25

Simplifying
x = -1.25
Solution
x = {4, -1.25}

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