9u^2+3u-20=0

Solution for 9u^2+3u-20=0 equation:

Simplifying
9u2 + 3u + -20 = 0

Reorder the terms:
-20 + 3u + 9u2 = 0

Solving
-20 + 3u + 9u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-5 + -3u)(4 + -3u) = 0

Subproblem 1
Set the factor '(-5 + -3u)' equal to zero and attempt to solve:

Simplifying
-5 + -3u = 0

Solving
-5 + -3u = 0

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

Add '5' to each side of the equation.
-5 + 5 + -3u = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -3u = 0 + 5
-3u = 0 + 5

Combine like terms: 0 + 5 = 5
-3u = 5

Divide each side by '-3'.
u = -1.666666667

Simplifying
u = -1.666666667
Subproblem 2
Set the factor '(4 + -3u)' equal to zero and attempt to solve:

Simplifying
4 + -3u = 0

Solving
4 + -3u = 0

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

Add '-4' to each side of the equation.
4 + -4 + -3u = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -3u = 0 + -4
-3u = 0 + -4

Combine like terms: 0 + -4 = -4
-3u = -4

Divide each side by '-3'.
u = 1.333333333

Simplifying
u = 1.333333333
Solution
u = {-1.666666667, 1.333333333}