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

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


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

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

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

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

Combine like terms: -4x + 14x = 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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