4t^2+20t-3t-15=0

Solution for 4t^2+20t-3t-15=0 equation:

Simplifying
4t2 + 20t + -3t + -15 = 0

Reorder the terms:
-15 + 20t + -3t + 4t2 = 0

Combine like terms: 20t + -3t = 17t
-15 + 17t + 4t2 = 0

Solving
-15 + 17t + 4t2 = 0

Solving for variable 't'.

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

Subproblem 1
Set the factor '(-5 + -1t)' equal to zero and attempt to solve:

Simplifying
-5 + -1t = 0

Solving
-5 + -1t = 0

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

Add '5' to each side of the equation.
-5 + 5 + -1t = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1t = 0 + 5
-1t = 0 + 5

Combine like terms: 0 + 5 = 5
-1t = 5

Divide each side by '-1'.
t = -5

Simplifying
t = -5
Subproblem 2
Set the factor '(3 + -4t)' equal to zero and attempt to solve:

Simplifying
3 + -4t = 0

Solving
3 + -4t = 0

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

Add '-3' to each side of the equation.
3 + -3 + -4t = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -4t = 0 + -3
-4t = 0 + -3

Combine like terms: 0 + -3 = -3
-4t = -3

Divide each side by '-4'.
t = 0.75

Simplifying
t = 0.75
Solution
t = {-5, 0.75}