4s^2-15s-4=0

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

Simplifying
4s2 + -15s + -4 = 0

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

Solving
-4 + -15s + 4s2 = 0

Solving for variable 's'.

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

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

Simplifying
-1 + -4s = 0

Solving
-1 + -4s = 0

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

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

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

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

Divide each side by '-4'.
s = -0.25

Simplifying
s = -0.25
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 = {-0.25, 4}