u^2-8=

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Solution for u^2-8= equation: 


Simplifying
u2 + -8 = 0

Reorder the terms:
-8 + u2 = 0

Solving
-8 + u2 = 0

Solving for variable 'u'.

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

Add '8' to each side of the equation.
-8 + 8 + u2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + u2 = 0 + 8
u2 = 0 + 8

Combine like terms: 0 + 8 = 8
u2 = 8

Simplifying
u2 = 8

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

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