x^2-8=-1

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Solution for x^2-8=-1 equation: 


Simplifying
x2 + -8 = -1

Reorder the terms:
-8 + x2 = -1

Solving
-8 + x2 = -1

Solving for variable 'x'.

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

Add '8' to each side of the equation.
-8 + 8 + x2 = -1 + 8

Combine like terms: -8 + 8 = 0
0 + x2 = -1 + 8
x2 = -1 + 8

Combine like terms: -1 + 8 = 7
x2 = 7

Simplifying
x2 = 7

Take the square root of each side:
x = {-2.645751311, 2.645751311}

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