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Simplifying
x * x + -2 = 255
Multiply x * x
x2 + -2 = 255
Reorder the terms:
-2 + x2 = 255
Solving
-2 + x2 = 255
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '2' to each side of the equation.
-2 + 2 + x2 = 255 + 2
Combine like terms: -2 + 2 = 0
0 + x2 = 255 + 2
x2 = 255 + 2
Combine like terms: 255 + 2 = 257
x2 = 257
Simplifying
x2 = 257
Take the square root of each side:
x = {-16.031219542, 16.031219542}
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