(3+u)(2u+9)=0

Solution for (3+u)(2u+9)=0 equation:

Simplifying
(3 + u)(2u + 9) = 0

Reorder the terms:
(3 + u)(9 + 2u) = 0

Multiply (3 + u) * (9 + 2u)
(3(9 + 2u) + u(9 + 2u)) = 0
((9 * 3 + 2u * 3) + u(9 + 2u)) = 0
((27 + 6u) + u(9 + 2u)) = 0
(27 + 6u + (9 * u + 2u * u)) = 0
(27 + 6u + (9u + 2u2)) = 0

Combine like terms: 6u + 9u = 15u
(27 + 15u + 2u2) = 0

Solving
27 + 15u + 2u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(9 + 2u)(3 + u) = 0

Subproblem 1
Set the factor '(9 + 2u)' equal to zero and attempt to solve:

Simplifying
9 + 2u = 0

Solving
9 + 2u = 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 + 2u = 0 + -9

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

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

Divide each side by '2'.
u = -4.5

Simplifying
u = -4.5
Subproblem 2
Set the factor '(3 + u)' equal to zero and attempt to solve:

Simplifying
3 + u = 0

Solving
3 + u = 0

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

Add '-3' to each side of the equation.
3 + -3 + u = 0 + -3

Combine like terms: 3 + -3 = 0
0 + u = 0 + -3
u = 0 + -3

Combine like terms: 0 + -3 = -3
u = -3

Simplifying
u = -3
Solution
u = {-4.5, -3}