u^2-90=0

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Solution for u^2-90=0 equation: 


Simplifying
u2 + -90 = 0

Reorder the terms:
-90 + u2 = 0

Solving
-90 + u2 = 0

Solving for variable 'u'.

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

Add '90' to each side of the equation.
-90 + 90 + u2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + u2 = 0 + 90
u2 = 0 + 90

Combine like terms: 0 + 90 = 90
u2 = 90

Simplifying
u2 = 90

Take the square root of each side:
u = {-9.486832981, 9.486832981}

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