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

Solution for (6+u)(2u+9)=0 equation:

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

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

Multiply (6 + u) * (9 + 2u)
(6(9 + 2u) + u(9 + 2u)) = 0
((9 * 6 + 2u * 6) + u(9 + 2u)) = 0
((54 + 12u) + u(9 + 2u)) = 0
(54 + 12u + (9 * u + 2u * u)) = 0
(54 + 12u + (9u + 2u2)) = 0

Combine like terms: 12u + 9u = 21u
(54 + 21u + 2u2) = 0

Solving
54 + 21u + 2u2 = 0

Solving for variable 'u'.

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

Subproblem 1
Set the factor '(6 + u)' equal to zero and attempt to solve:

Simplifying
6 + u = 0

Solving
6 + u = 0

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

Add '-6' to each side of the equation.
6 + -6 + u = 0 + -6

Combine like terms: 6 + -6 = 0
0 + u = 0 + -6
u = 0 + -6

Combine like terms: 0 + -6 = -6
u = -6

Simplifying
u = -6
Subproblem 2
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
Solution
u = {-6, -4.5}