(-3u)(-9-9u)=

Solution for (-3u)(-9-9u)= equation:

Simplifying
(-3u)(-9 + -9u) = 0

Remove parenthesis around (-3u)
-3u(-9 + -9u) = 0
(-9 * -3u + -9u * -3u) = 0
(27u + 27u2) = 0

Solving
27u + 27u2 = 0

Solving for variable 'u'.

Factor out the Greatest Common Factor (GCF), '27u'.
27u(1 + u) = 0

Ignore the factor 27.
Subproblem 1
Set the factor 'u' equal to zero and attempt to solve:

Simplifying
u = 0

Solving
u = 0

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

Simplifying
u = 0
Subproblem 2
Set the factor '(1 + u)' equal to zero and attempt to solve:

Simplifying
1 + u = 0

Solving
1 + u = 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 + u = 0 + -1

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

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

Simplifying
u = -1
Solution
u = {0, -1}