9(9)+18(18)=x(x)

Solution for 9(9)+18(18)=x(x) equation:

Simplifying
9(9) + 18(18) = x(x)

Multiply 9 * 9
81 + 18(18) = x(x)

Multiply 18 * 18
81 + 324 = x(x)

Combine like terms: 81 + 324 = 405
405 = x(x)

Multiply x * x
405 = x2

Solving
405 = x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
405 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
405 + -1x2 = 0

Add '-405' to each side of the equation.
405 + -405 + -1x2 = 0 + -405

Combine like terms: 405 + -405 = 0
0 + -1x2 = 0 + -405
-1x2 = 0 + -405

Combine like terms: 0 + -405 = -405
-1x2 = -405

Divide each side by '-1'.
x2 = 405

Simplifying
x2 = 405

Take the square root of each side:
x = {-20.124611797, 20.124611797}