4m^2-7m-15=0

Solution for 4m^2-7m-15=0 equation:

Simplifying
4m2 + -7m + -15 = 0

Reorder the terms:
-15 + -7m + 4m2 = 0

Solving
-15 + -7m + 4m2 = 0

Solving for variable 'm'.

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

Subproblem 1
Set the factor '(-5 + -4m)' equal to zero and attempt to solve:

Simplifying
-5 + -4m = 0

Solving
-5 + -4m = 0

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

Add '5' to each side of the equation.
-5 + 5 + -4m = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -4m = 0 + 5
-4m = 0 + 5

Combine like terms: 0 + 5 = 5
-4m = 5

Divide each side by '-4'.
m = -1.25

Simplifying
m = -1.25
Subproblem 2
Set the factor '(3 + -1m)' equal to zero and attempt to solve:

Simplifying
3 + -1m = 0

Solving
3 + -1m = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1m = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1m = 0 + -3
-1m = 0 + -3

Combine like terms: 0 + -3 = -3
-1m = -3

Divide each side by '-1'.
m = 3

Simplifying
m = 3
Solution
m = {-1.25, 3}