(4x-4)(5x+7)=0

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Solution for (4x-4)(5x+7)=0 equation: 


Simplifying
(4x + -4)(5x + 7) = 0

Reorder the terms:
(-4 + 4x)(5x + 7) = 0

Reorder the terms:
(-4 + 4x)(7 + 5x) = 0

Multiply (-4 + 4x) * (7 + 5x)
(-4(7 + 5x) + 4x * (7 + 5x)) = 0
((7 * -4 + 5x * -4) + 4x * (7 + 5x)) = 0
((-28 + -20x) + 4x * (7 + 5x)) = 0
(-28 + -20x + (7 * 4x + 5x * 4x)) = 0
(-28 + -20x + (28x + 20x2)) = 0

Combine like terms: -20x + 28x = 8x
(-28 + 8x + 20x2) = 0

Solving
-28 + 8x + 20x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-7 + 2x + 5x2) = 0

Factor a trinomial.
4((-7 + -5x)(1 + -1x)) = 0

Ignore the factor 4.

Subproblem 1
Set the factor '(-7 + -5x)' equal to zero and attempt to solve:

Simplifying
-7 + -5x = 0

Solving
-7 + -5x = 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 + -5x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -5x = 0 + 7
-5x = 0 + 7

Combine like terms: 0 + 7 = 7
-5x = 7

Divide each side by '-5'.
x = -1.4

Simplifying
x = -1.4

Subproblem 2
Set the factor '(1 + -1x)' equal to zero and attempt to solve:

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

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

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

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

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

Simplifying
x = 1
Solution
x = {-1.4, 1}

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