(5u-6)(9+u)=0

Solution for (5u-6)(9+u)=0 equation:

Simplifying
(5u + -6)(9 + u) = 0

Reorder the terms:
(-6 + 5u)(9 + u) = 0

Multiply (-6 + 5u) * (9 + u)
(-6(9 + u) + 5u * (9 + u)) = 0
((9 * -6 + u * -6) + 5u * (9 + u)) = 0
((-54 + -6u) + 5u * (9 + u)) = 0
(-54 + -6u + (9 * 5u + u * 5u)) = 0
(-54 + -6u + (45u + 5u2)) = 0

Combine like terms: -6u + 45u = 39u
(-54 + 39u + 5u2) = 0

Solving
-54 + 39u + 5u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-9 + -1u)(6 + -5u) = 0

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

Simplifying
-9 + -1u = 0

Solving
-9 + -1u = 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 + -1u = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1u = 0 + 9
-1u = 0 + 9

Combine like terms: 0 + 9 = 9
-1u = 9

Divide each side by '-1'.
u = -9

Simplifying
u = -9
Subproblem 2
Set the factor '(6 + -5u)' equal to zero and attempt to solve:

Simplifying
6 + -5u = 0

Solving
6 + -5u = 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 + -5u = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -5u = 0 + -6
-5u = 0 + -6

Combine like terms: 0 + -6 = -6
-5u = -6

Divide each side by '-5'.
u = 1.2

Simplifying
u = 1.2
Solution
u = {-9, 1.2}