56c^2-19c=15

Solution for 56c^2-19c=15 equation:

Simplifying
56c2 + -19c = 15

Reorder the terms:
-19c + 56c2 = 15

Solving
-19c + 56c2 = 15

Solving for variable 'c'.

Reorder the terms:
-15 + -19c + 56c2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -19c + 56c2 = 0

Factor a trinomial.
(-3 + -8c)(5 + -7c) = 0

Subproblem 1
Set the factor '(-3 + -8c)' equal to zero and attempt to solve:

Simplifying
-3 + -8c = 0

Solving
-3 + -8c = 0

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

Add '3' to each side of the equation.
-3 + 3 + -8c = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -8c = 0 + 3
-8c = 0 + 3

Combine like terms: 0 + 3 = 3
-8c = 3

Divide each side by '-8'.
c = -0.375

Simplifying
c = -0.375
Subproblem 2
Set the factor '(5 + -7c)' equal to zero and attempt to solve:

Simplifying
5 + -7c = 0

Solving
5 + -7c = 0

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

Add '-5' to each side of the equation.
5 + -5 + -7c = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -7c = 0 + -5
-7c = 0 + -5

Combine like terms: 0 + -5 = -5
-7c = -5

Divide each side by '-7'.
c = 0.7142857143

Simplifying
c = 0.7142857143
Solution
c = {-0.375, 0.7142857143}