(u-4)(u+4)=

Solution for (u-4)(u+4)= equation:

Simplifying
(u + -4)(u + 4) = 0

Reorder the terms:
(-4 + u)(u + 4) = 0

Reorder the terms:
(-4 + u)(4 + u) = 0

Multiply (-4 + u) * (4 + u)
(-4(4 + u) + u(4 + u)) = 0
((4 * -4 + u * -4) + u(4 + u)) = 0
((-16 + -4u) + u(4 + u)) = 0
(-16 + -4u + (4 * u + u * u)) = 0
(-16 + -4u + (4u + u2)) = 0

Combine like terms: -4u + 4u = 0
(-16 + 0 + u2) = 0
(-16 + u2) = 0

Solving
-16 + u2 = 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 + u2 = 0 + 16

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

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

Simplifying
u2 = 16

Take the square root of each side:
u = {-4, 4}