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

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

Simplifying
(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}