u^2-9=0

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Solution for u^2-9=0 equation: 


Simplifying
u2 + -9 = 0

Reorder the terms:
-9 + u2 = 0

Solving
-9 + u2 = 0

Solving for variable 'u'.

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

Add '9' to each side of the equation.
-9 + 9 + u2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + u2 = 0 + 9
u2 = 0 + 9

Combine like terms: 0 + 9 = 9
u2 = 9

Simplifying
u2 = 9

Take the square root of each side:
u = {-3, 3}

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