15*15+6*6=x*x

Solution for 15*15+6*6=x*x equation:

Simplifying
15 * 15 + 6 * 6 = x * x

Multiply 15 * 15
225 + 6 * 6 = x * x

Multiply 6 * 6
225 + 36 = x * x

Combine like terms: 225 + 36 = 261
261 = x * x

Multiply x * x
261 = x2

Solving
261 = 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.
261 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
261 + -1x2 = 0

Add '-261' to each side of the equation.
261 + -261 + -1x2 = 0 + -261

Combine like terms: 261 + -261 = 0
0 + -1x2 = 0 + -261
-1x2 = 0 + -261

Combine like terms: 0 + -261 = -261
-1x2 = -261

Divide each side by '-1'.
x2 = 261

Simplifying
x2 = 261

Take the square root of each side:
x = {-16.155494421, 16.155494421}