(u-1)(u+8)=

Solution for (u-1)(u+8)= equation:

Simplifying
(u + -1)(u + 8) = 0

Reorder the terms:
(-1 + u)(u + 8) = 0

Reorder the terms:
(-1 + u)(8 + u) = 0

Multiply (-1 + u) * (8 + u)
(-1(8 + u) + u(8 + u)) = 0
((8 * -1 + u * -1) + u(8 + u)) = 0
((-8 + -1u) + u(8 + u)) = 0
(-8 + -1u + (8 * u + u * u)) = 0
(-8 + -1u + (8u + u2)) = 0

Combine like terms: -1u + 8u = 7u
(-8 + 7u + u2) = 0

Solving
-8 + 7u + u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-8 + -1u)(1 + -1u) = 0

Subproblem 1
Set the factor '(-8 + -1u)' equal to zero and attempt to solve:

Simplifying
-8 + -1u = 0

Solving
-8 + -1u = 0

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

Add '8' to each side of the equation.
-8 + 8 + -1u = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -1u = 0 + 8
-1u = 0 + 8

Combine like terms: 0 + 8 = 8
-1u = 8

Divide each side by '-1'.
u = -8

Simplifying
u = -8
Subproblem 2
Set the factor '(1 + -1u)' equal to zero and attempt to solve:

Simplifying
1 + -1u = 0

Solving
1 + -1u = 0

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

Add '-1' to each side of the equation.
1 + -1 + -1u = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -1u = 0 + -1
-1u = 0 + -1

Combine like terms: 0 + -1 = -1
-1u = -1

Divide each side by '-1'.
u = 1

Simplifying
u = 1
Solution
u = {-8, 1}