(9x+4)(9x-4)=

Solution for (9x+4)(9x-4)= equation:

Simplifying
(9x + 4)(9x + -4) = 0

Reorder the terms:
(4 + 9x)(9x + -4) = 0

Reorder the terms:
(4 + 9x)(-4 + 9x) = 0

Multiply (4 + 9x) * (-4 + 9x)
(4(-4 + 9x) + 9x * (-4 + 9x)) = 0
((-4 * 4 + 9x * 4) + 9x * (-4 + 9x)) = 0
((-16 + 36x) + 9x * (-4 + 9x)) = 0
(-16 + 36x + (-4 * 9x + 9x * 9x)) = 0
(-16 + 36x + (-36x + 81x2)) = 0

Combine like terms: 36x + -36x = 0
(-16 + 0 + 81x2) = 0
(-16 + 81x2) = 0

Solving
-16 + 81x2 = 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 + 81x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 81x2 = 0 + 16
81x2 = 0 + 16

Combine like terms: 0 + 16 = 16
81x2 = 16

Divide each side by '81'.
x2 = 0.1975308642

Simplifying
x2 = 0.1975308642

Take the square root of each side:
x = {-0.444444444, 0.444444444}