9k^2+21k-1=-11

Solution for 9k^2+21k-1=-11 equation:

Simplifying
9k2 + 21k + -1 = -11

Reorder the terms:
-1 + 21k + 9k2 = -11

Solving
-1 + 21k + 9k2 = -11

Solving for variable 'k'.

Reorder the terms:
-1 + 11 + 21k + 9k2 = -11 + 11

Combine like terms: -1 + 11 = 10
10 + 21k + 9k2 = -11 + 11

Combine like terms: -11 + 11 = 0
10 + 21k + 9k2 = 0

Factor a trinomial.
(5 + 3k)(2 + 3k) = 0

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

Simplifying
5 + 3k = 0

Solving
5 + 3k = 0

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

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

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

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

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

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

Simplifying
2 + 3k = 0

Solving
2 + 3k = 0

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

Add '-2' to each side of the equation.
2 + -2 + 3k = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 3k = 0 + -2
3k = 0 + -2

Combine like terms: 0 + -2 = -2
3k = -2

Divide each side by '3'.
k = -0.6666666667

Simplifying
k = -0.6666666667
Solution
k = {-1.666666667, -0.6666666667}