-4u^2+5=0

Solution for -4u^2+5=0 equation:

Simplifying
-4u2 + 5 = 0

Reorder the terms:
5 + -4u2 = 0

Solving
5 + -4u2 = 0

Solving for variable 'u'.

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

Add '-5' to each side of the equation.
5 + -5 + -4u2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -4u2 = 0 + -5
-4u2 = 0 + -5

Combine like terms: 0 + -5 = -5
-4u2 = -5

Divide each side by '-4'.
u2 = 1.25

Simplifying
u2 = 1.25

Take the square root of each side:
u = {-1.118033989, 1.118033989}