12=s^2-4s

Solution for 12=s^2-4s equation:

Simplifying
12 = s2 + -4s

Reorder the terms:
12 = -4s + s2

Solving
12 = -4s + s2

Solving for variable 's'.

Reorder the terms:
12 + 4s + -1s2 = -4s + 4s + s2 + -1s2

Combine like terms: -4s + 4s = 0
12 + 4s + -1s2 = 0 + s2 + -1s2
12 + 4s + -1s2 = s2 + -1s2

Combine like terms: s2 + -1s2 = 0
12 + 4s + -1s2 = 0

Factor a trinomial.
(6 + -1s)(2 + s) = 0

Subproblem 1
Set the factor '(6 + -1s)' equal to zero and attempt to solve:

Simplifying
6 + -1s = 0

Solving
6 + -1s = 0

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

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

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

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

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

Simplifying
s = 6
Subproblem 2
Set the factor '(2 + s)' equal to zero and attempt to solve:

Simplifying
2 + s = 0

Solving
2 + s = 0

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

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

Combine like terms: 2 + -2 = 0
0 + s = 0 + -2
s = 0 + -2

Combine like terms: 0 + -2 = -2
s = -2

Simplifying
s = -2
Solution
s = {6, -2}