(x+7)(2x-4)=0

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Solution for (x+7)(2x-4)=0 equation: 


Simplifying
(x + 7)(2x + -4) = 0

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

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

Multiply (7 + x) * (-4 + 2x)
(7(-4 + 2x) + x(-4 + 2x)) = 0
((-4 * 7 + 2x * 7) + x(-4 + 2x)) = 0
((-28 + 14x) + x(-4 + 2x)) = 0
(-28 + 14x + (-4 * x + 2x * x)) = 0
(-28 + 14x + (-4x + 2x2)) = 0

Combine like terms: 14x + -4x = 10x
(-28 + 10x + 2x2) = 0

Solving
-28 + 10x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-14 + 5x + x2) = 0

Factor a trinomial.
2((-7 + -1x)(2 + -1x)) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-7 + -1x)' equal to zero and attempt to solve:

Simplifying
-7 + -1x = 0

Solving
-7 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + -1x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -1x = 0 + 7
-1x = 0 + 7

Combine like terms: 0 + 7 = 7
-1x = 7

Divide each side by '-1'.
x = -7

Simplifying
x = -7

Subproblem 2
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
Solution
x = {-7, 2}

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