(.8x+2)(.8x-2)=

Solution for (.8x+2)(.8x-2)= equation:

Simplifying
(0.8x + 2)(0.8x + -2) = 0

Reorder the terms:
(2 + 0.8x)(0.8x + -2) = 0

Reorder the terms:
(2 + 0.8x)(-2 + 0.8x) = 0

Multiply (2 + 0.8x) * (-2 + 0.8x)
(2(-2 + 0.8x) + 0.8x * (-2 + 0.8x)) = 0
((-2 * 2 + 0.8x * 2) + 0.8x * (-2 + 0.8x)) = 0
((-4 + 1.6x) + 0.8x * (-2 + 0.8x)) = 0
(-4 + 1.6x + (-2 * 0.8x + 0.8x * 0.8x)) = 0
(-4 + 1.6x + (-1.6x + 0.64x2)) = 0

Combine like terms: 1.6x + -1.6x = 0.0
(-4 + 0.0 + 0.64x2) = 0
(-4 + 0.64x2) = 0

Solving
-4 + 0.64x2 = 0

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 0.64x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.64x2 = 0 + 4
0.64x2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.64x2 = 4

Divide each side by '0.64'.
x2 = 6.25

Simplifying
x2 = 6.25

Take the square root of each side:
x = {-2.5, 2.5}