u^2-81w^2=0

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Solution for u^2-81w^2=0 equation: 


Simplifying
u2 + -81w2 = 0

Solving
u2 + -81w2 = 0

Solving for variable 'u'.

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

Add '81w2' to each side of the equation.
u2 + -81w2 + 81w2 = 0 + 81w2

Combine like terms: -81w2 + 81w2 = 0
u2 + 0 = 0 + 81w2
u2 = 0 + 81w2
Remove the zero:
u2 = 81w2

Simplifying
u2 = 81w2

Take the square root of each side:
u = {-9w, 9w}

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