-2u^2-18u=0

Solution for -2u^2-18u=0 equation:

Simplifying
-2u2 + -18u = 0

Reorder the terms:
-18u + -2u2 = 0

Solving
-18u + -2u2 = 0

Solving for variable 'u'.

Factor out the Greatest Common Factor (GCF), '-2u'.
-2u(9 + u) = 0

Ignore the factor -2.
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 '(9 + u)' equal to zero and attempt to solve:

Simplifying
9 + u = 0

Solving
9 + u = 0

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

Add '-9' to each side of the equation.
9 + -9 + u = 0 + -9

Combine like terms: 9 + -9 = 0
0 + u = 0 + -9
u = 0 + -9

Combine like terms: 0 + -9 = -9
u = -9

Simplifying
u = -9
Solution
u = {0, -9}