=(9x+8)(9x-8)

Solution for =(9x+8)(9x-8) equation:

Simplifying
0 = (9x + 8)(9x + -8)

Reorder the terms:
0 = (8 + 9x)(9x + -8)

Reorder the terms:
0 = (8 + 9x)(-8 + 9x)

Multiply (8 + 9x) * (-8 + 9x)
0 = (8(-8 + 9x) + 9x * (-8 + 9x))
0 = ((-8 * 8 + 9x * 8) + 9x * (-8 + 9x))
0 = ((-64 + 72x) + 9x * (-8 + 9x))
0 = (-64 + 72x + (-8 * 9x + 9x * 9x))
0 = (-64 + 72x + (-72x + 81x2))

Combine like terms: 72x + -72x = 0
0 = (-64 + 0 + 81x2)
0 = (-64 + 81x2)

Solving
0 = -64 + 81x2

Solving for variable 'x'.

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

Add '-81x2' to each side of the equation.
0 + -81x2 = -64 + 81x2 + -81x2
Remove the zero:
-81x2 = -64 + 81x2 + -81x2

Combine like terms: 81x2 + -81x2 = 0
-81x2 = -64 + 0
-81x2 = -64

Divide each side by '-81'.
x2 = 0.7901234568

Simplifying
x2 = 0.7901234568

Take the square root of each side:
x = {-0.888888889, 0.888888889}