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

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


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

Multiply (4 + -2x) * (5 + 2x)
(4(5 + 2x) + -2x * (5 + 2x)) = 0
((5 * 4 + 2x * 4) + -2x * (5 + 2x)) = 0
((20 + 8x) + -2x * (5 + 2x)) = 0
(20 + 8x + (5 * -2x + 2x * -2x)) = 0
(20 + 8x + (-10x + -4x2)) = 0

Combine like terms: 8x + -10x = -2x
(20 + -2x + -4x2) = 0

Solving
20 + -2x + -4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(10 + -1x + -2x2) = 0

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

Ignore the factor 2.

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 '(5 + 2x)' equal to zero and attempt to solve:

Simplifying
5 + 2x = 0

Solving
5 + 2x = 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 + 2x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 2x = 0 + -5
2x = 0 + -5

Combine like terms: 0 + -5 = -5
2x = -5

Divide each side by '2'.
x = -2.5

Simplifying
x = -2.5
Solution
x = {2, -2.5}

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