x*x=20*20-16*16

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Solution for x*x=20*20-16*16 equation: 


Simplifying
x * x = 20 * 20 + -16 * 16

Multiply x * x
x2 = 20 * 20 + -16 * 16

Multiply 20 * 20
x2 = 400 + -16 * 16

Multiply -16 * 16
x2 = 400 + -256

Combine like terms: 400 + -256 = 144
x2 = 144

Solving
x2 = 144

Solving for variable 'x'.

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

Simplifying
x2 = 144

Take the square root of each side:
x = {-12, 12}

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