9x*9x-16=0

Solution for 9x*9x-16=0 equation:

Simplifying
9x * 9x + -16 = 0

Reorder the terms for easier multiplication:
9 * 9x * x + -16 = 0

Multiply 9 * 9
81x * x + -16 = 0

Multiply x * x
81x2 + -16 = 0

Reorder the terms:
-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}