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Simplifying
15 * 15 + 9 * 9 = x * x
Multiply 15 * 15
225 + 9 * 9 = x * x
Multiply 9 * 9
225 + 81 = x * x
Combine like terms: 225 + 81 = 306
306 = x * x
Multiply x * x
306 = x2
Solving
306 = 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.
306 + -1x2 = x2 + -1x2
Combine like terms: x2 + -1x2 = 0
306 + -1x2 = 0
Add '-306' to each side of the equation.
306 + -306 + -1x2 = 0 + -306
Combine like terms: 306 + -306 = 0
0 + -1x2 = 0 + -306
-1x2 = 0 + -306
Combine like terms: 0 + -306 = -306
-1x2 = -306
Divide each side by '-1'.
x2 = 306
Simplifying
x2 = 306
Take the square root of each side:
x = {-17.492855685, 17.492855685}
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