5U^2-4U-9=0

Solution for 5U^2-4U-9=0 equation:

Simplifying
5U2 + -4U + -9 = 0

Reorder the terms:
-9 + -4U + 5U2 = 0

Solving
-9 + -4U + 5U2 = 0

Solving for variable 'U'.

Factor a trinomial.
(-1 + -1U)(9 + -5U) = 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 + -5U)' equal to zero and attempt to solve:

Simplifying
9 + -5U = 0

Solving
9 + -5U = 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 + -5U = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -5U = 0 + -9
-5U = 0 + -9

Combine like terms: 0 + -9 = -9
-5U = -9

Divide each side by '-5'.
U = 1.8

Simplifying
U = 1.8
Solution
U = {-1, 1.8}