-15s^2+4s+4=0

Solution for -15s^2+4s+4=0 equation:

Simplifying
-15s2 + 4s + 4 = 0

Reorder the terms:
4 + 4s + -15s2 = 0

Solving
4 + 4s + -15s2 = 0

Solving for variable 's'.

Factor a trinomial.
(2 + -3s)(2 + 5s) = 0

Subproblem 1
Set the factor '(2 + -3s)' equal to zero and attempt to solve:

Simplifying
2 + -3s = 0

Solving
2 + -3s = 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 + -3s = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3s = 0 + -2
-3s = 0 + -2

Combine like terms: 0 + -2 = -2
-3s = -2

Divide each side by '-3'.
s = 0.6666666667

Simplifying
s = 0.6666666667
Subproblem 2
Set the factor '(2 + 5s)' equal to zero and attempt to solve:

Simplifying
2 + 5s = 0

Solving
2 + 5s = 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 + 5s = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 5s = 0 + -2
5s = 0 + -2

Combine like terms: 0 + -2 = -2
5s = -2

Divide each side by '5'.
s = -0.4

Simplifying
s = -0.4
Solution
s = {0.6666666667, -0.4}