2u^2+9u=-4

Solution for 2u^2+9u=-4 equation:

Simplifying
2u2 + 9u = -4

Reorder the terms:
9u + 2u2 = -4

Solving
9u + 2u2 = -4

Solving for variable 'u'.

Reorder the terms:
4 + 9u + 2u2 = -4 + 4

Combine like terms: -4 + 4 = 0
4 + 9u + 2u2 = 0

Factor a trinomial.
(4 + u)(1 + 2u) = 0

Subproblem 1
Set the factor '(4 + u)' equal to zero and attempt to solve:

Simplifying
4 + u = 0

Solving
4 + u = 0

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

Add '-4' to each side of the equation.
4 + -4 + u = 0 + -4

Combine like terms: 4 + -4 = 0
0 + u = 0 + -4
u = 0 + -4

Combine like terms: 0 + -4 = -4
u = -4

Simplifying
u = -4
Subproblem 2
Set the factor '(1 + 2u)' equal to zero and attempt to solve:

Simplifying
1 + 2u = 0

Solving
1 + 2u = 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 + 2u = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2u = 0 + -1
2u = 0 + -1

Combine like terms: 0 + -1 = -1
2u = -1

Divide each side by '2'.
u = -0.5

Simplifying
u = -0.5
Solution
u = {-4, -0.5}