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

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

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

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

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

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

Combine like terms: -10x + 4x = -6x
(-20 + -6x + 2x2) = 0

Solving
-20 + -6x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-10 + -3x + x2) = 0

Factor a trinomial.
2((-2 + -1x)(5 + -1x)) = 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 + -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
Solution
x = {-2, 5}