3s^2-7s-20=0

Solution for 3s^2-7s-20=0 equation:

Simplifying
3s2 + -7s + -20 = 0

Reorder the terms:
-20 + -7s + 3s2 = 0

Solving
-20 + -7s + 3s2 = 0

Solving for variable 's'.

Factor a trinomial.
(-5 + -3s)(4 + -1s) = 0

Subproblem 1
Set the factor '(-5 + -3s)' equal to zero and attempt to solve:

Simplifying
-5 + -3s = 0

Solving
-5 + -3s = 0

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

Add '5' to each side of the equation.
-5 + 5 + -3s = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -3s = 0 + 5
-3s = 0 + 5

Combine like terms: 0 + 5 = 5
-3s = 5

Divide each side by '-3'.
s = -1.666666667

Simplifying
s = -1.666666667
Subproblem 2
Set the factor '(4 + -1s)' equal to zero and attempt to solve:

Simplifying
4 + -1s = 0

Solving
4 + -1s = 0

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

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

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

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

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

Simplifying
s = 4
Solution
s = {-1.666666667, 4}