5u^2-90=9

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Solution for 5u^2-90=9 equation:


Simplifying
5u2 + -90 = 9

Reorder the terms:
-90 + 5u2 = 9

Solving
-90 + 5u2 = 9

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 + 5u2 = 9 + 90

Combine like terms: -90 + 90 = 0
0 + 5u2 = 9 + 90
5u2 = 9 + 90

Combine like terms: 9 + 90 = 99
5u2 = 99

Divide each side by '5'.
u2 = 19.8

Simplifying
u2 = 19.8

Take the square root of each side:
u = {-4.449719092, 4.449719092}

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