15c^2-8c-12=0

Solution for 15c^2-8c-12=0 equation:

Simplifying
15c2 + -8c + -12 = 0

Reorder the terms:
-12 + -8c + 15c2 = 0

Solving
-12 + -8c + 15c2 = 0

Solving for variable 'c'.

Factor a trinomial.
(-2 + -3c)(6 + -5c) = 0

Subproblem 1
Set the factor '(-2 + -3c)' equal to zero and attempt to solve:

Simplifying
-2 + -3c = 0

Solving
-2 + -3c = 0

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

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

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

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

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

Simplifying
c = -0.6666666667
Subproblem 2
Set the factor '(6 + -5c)' equal to zero and attempt to solve:

Simplifying
6 + -5c = 0

Solving
6 + -5c = 0

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

Add '-6' to each side of the equation.
6 + -6 + -5c = 0 + -6

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

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

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

Simplifying
c = 1.2
Solution
c = {-0.6666666667, 1.2}