(2u-9)(1+u)=0

Solution for (2u-9)(1+u)=0 equation:

Simplifying
(2u + -9)(1 + u) = 0

Reorder the terms:
(-9 + 2u)(1 + u) = 0

Multiply (-9 + 2u) * (1 + u)
(-9(1 + u) + 2u * (1 + u)) = 0
((1 * -9 + u * -9) + 2u * (1 + u)) = 0
((-9 + -9u) + 2u * (1 + u)) = 0
(-9 + -9u + (1 * 2u + u * 2u)) = 0
(-9 + -9u + (2u + 2u2)) = 0

Combine like terms: -9u + 2u = -7u
(-9 + -7u + 2u2) = 0

Solving
-9 + -7u + 2u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-1 + -1u)(9 + -2u) = 0

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

Simplifying
-1 + -1u = 0

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

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

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

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

Simplifying
u = -1
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 = {-1, 4.5}