5k^2-39k-8=0

Solution for 5k^2-39k-8=0 equation:

Simplifying
5k2 + -39k + -8 = 0

Reorder the terms:
-8 + -39k + 5k2 = 0

Solving
-8 + -39k + 5k2 = 0

Solving for variable 'k'.

Factor a trinomial.
(-1 + -5k)(8 + -1k) = 0

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

Simplifying
-1 + -5k = 0

Solving
-1 + -5k = 0

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

Add '1' to each side of the equation.
-1 + 1 + -5k = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -5k = 0 + 1
-5k = 0 + 1

Combine like terms: 0 + 1 = 1
-5k = 1

Divide each side by '-5'.
k = -0.2

Simplifying
k = -0.2
Subproblem 2
Set the factor '(8 + -1k)' equal to zero and attempt to solve:

Simplifying
8 + -1k = 0

Solving
8 + -1k = 0

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

Add '-8' to each side of the equation.
8 + -8 + -1k = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1k = 0 + -8
-1k = 0 + -8

Combine like terms: 0 + -8 = -8
-1k = -8

Divide each side by '-1'.
k = 8

Simplifying
k = 8
Solution
k = {-0.2, 8}