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

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

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

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

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

Multiply (4 + 5x) * (-4 + 5x)
(4(-4 + 5x) + 5x * (-4 + 5x)) = 0
((-4 * 4 + 5x * 4) + 5x * (-4 + 5x)) = 0
((-16 + 20x) + 5x * (-4 + 5x)) = 0
(-16 + 20x + (-4 * 5x + 5x * 5x)) = 0
(-16 + 20x + (-20x + 25x2)) = 0

Combine like terms: 20x + -20x = 0
(-16 + 0 + 25x2) = 0
(-16 + 25x2) = 0

Solving
-16 + 25x2 = 0

Solving for variable 'x'.

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

Add '16' to each side of the equation.
-16 + 16 + 25x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 25x2 = 0 + 16
25x2 = 0 + 16

Combine like terms: 0 + 16 = 16
25x2 = 16

Divide each side by '25'.
x2 = 0.64

Simplifying
x2 = 0.64

Take the square root of each side:
x = {-0.8, 0.8}