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

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


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

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

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

Multiply (-4 + 4x) * (5 + 4x)
(-4(5 + 4x) + 4x * (5 + 4x)) = 0
((5 * -4 + 4x * -4) + 4x * (5 + 4x)) = 0
((-20 + -16x) + 4x * (5 + 4x)) = 0
(-20 + -16x + (5 * 4x + 4x * 4x)) = 0
(-20 + -16x + (20x + 16x2)) = 0

Combine like terms: -16x + 20x = 4x
(-20 + 4x + 16x2) = 0

Solving
-20 + 4x + 16x2 = 0

Solving for variable 'x'.

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

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

Ignore the factor 4.

Subproblem 1
Set the factor '(-5 + -4x)' equal to zero and attempt to solve:

Simplifying
-5 + -4x = 0

Solving
-5 + -4x = 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 + -4x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -4x = 0 + 5
-4x = 0 + 5

Combine like terms: 0 + 5 = 5
-4x = 5

Divide each side by '-4'.
x = -1.25

Simplifying
x = -1.25

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 = {-1.25, 1}

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