25u^2-20+4=0

Solution for 25u^2-20+4=0 equation:

Simplifying
25u2 + -20 + 4 = 0

Reorder the terms:
-20 + 4 + 25u2 = 0

Combine like terms: -20 + 4 = -16
-16 + 25u2 = 0

Solving
-16 + 25u2 = 0

Solving for variable 'u'.

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

Add '16' to each side of the equation.
-16 + 16 + 25u2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 25u2 = 0 + 16
25u2 = 0 + 16

Combine like terms: 0 + 16 = 16
25u2 = 16

Divide each side by '25'.
u2 = 0.64

Simplifying
u2 = 0.64

Take the square root of each side:
u = {-0.8, 0.8}