-x^2=-8

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Solution for -x^2=-8 equation: 


Simplifying
-1x2 = -8

Solving
-1x2 = -8

Solving for variable 'x'.

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

Divide each side by '-1'.
x2 = 8

Simplifying
x2 = 8

Take the square root of each side:
x = {-2.828427125, 2.828427125}

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