k^2-2k-28=-4

Solution for k^2-2k-28=-4 equation:

Simplifying
k2 + -2k + -28 = -4

Reorder the terms:
-28 + -2k + k2 = -4

Solving
-28 + -2k + k2 = -4

Solving for variable 'k'.

Reorder the terms:
-28 + 4 + -2k + k2 = -4 + 4

Combine like terms: -28 + 4 = -24
-24 + -2k + k2 = -4 + 4

Combine like terms: -4 + 4 = 0
-24 + -2k + k2 = 0

Factor a trinomial.
(-4 + -1k)(6 + -1k) = 0

Subproblem 1
Set the factor '(-4 + -1k)' equal to zero and attempt to solve:

Simplifying
-4 + -1k = 0

Solving
-4 + -1k = 0

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

Add '4' to each side of the equation.
-4 + 4 + -1k = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1k = 0 + 4
-1k = 0 + 4

Combine like terms: 0 + 4 = 4
-1k = 4

Divide each side by '-1'.
k = -4

Simplifying
k = -4
Subproblem 2
Set the factor '(6 + -1k)' equal to zero and attempt to solve:

Simplifying
6 + -1k = 0

Solving
6 + -1k = 0

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

Add '-6' to each side of the equation.
6 + -6 + -1k = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -1k = 0 + -6
-1k = 0 + -6

Combine like terms: 0 + -6 = -6
-1k = -6

Divide each side by '-1'.
k = 6

Simplifying
k = 6
Solution
k = {-4, 6}