(u+5)(u-5)=

Solution for (u+5)(u-5)= equation:

Simplifying
(u + 5)(u + -5) = 0

Reorder the terms:
(5 + u)(u + -5) = 0

Reorder the terms:
(5 + u)(-5 + u) = 0

Multiply (5 + u) * (-5 + u)
(5(-5 + u) + u(-5 + u)) = 0
((-5 * 5 + u * 5) + u(-5 + u)) = 0
((-25 + 5u) + u(-5 + u)) = 0
(-25 + 5u + (-5 * u + u * u)) = 0
(-25 + 5u + (-5u + u2)) = 0

Combine like terms: 5u + -5u = 0
(-25 + 0 + u2) = 0
(-25 + u2) = 0

Solving
-25 + u2 = 0

Solving for variable 'u'.

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

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

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

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

Simplifying
u2 = 25

Take the square root of each side:
u = {-5, 5}