-3u(u+1)=0

Solution for -3u(u+1)=0 equation:

Simplifying
-3u(u + 1) = 0

Reorder the terms:
-3u(1 + u) = 0
(1 * -3u + u * -3u) = 0
(-3u + -3u2) = 0

Solving
-3u + -3u2 = 0

Solving for variable 'u'.

Factor out the Greatest Common Factor (GCF), '-3u'.
-3u(1 + u) = 0

Ignore the factor -3.
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}