5u^2-45=0

Solution for 5u^2-45=0 equation:

Simplifying
5u2 + -45 = 0

Reorder the terms:
-45 + 5u2 = 0

Solving
-45 + 5u2 = 0

Solving for variable 'u'.

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

Add '45' to each side of the equation.
-45 + 45 + 5u2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 5u2 = 0 + 45
5u2 = 0 + 45

Combine like terms: 0 + 45 = 45
5u2 = 45

Divide each side by '5'.
u2 = 9

Simplifying
u2 = 9

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