16=9x(9x)

Solution for 16=9x(9x) equation:

Simplifying
16 = 9x(9x)

Remove parenthesis around (9x)
16 = 9x * 9x

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

Multiply 9 * 9
16 = 81x * x

Multiply x * x
16 = 81x2

Solving
16 = 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.
16 + -81x2 = 81x2 + -81x2

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

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}