4m^2-25m-21=0

Solution for 4m^2-25m-21=0 equation:

Simplifying
4m2 + -25m + -21 = 0

Reorder the terms:
-21 + -25m + 4m2 = 0

Solving
-21 + -25m + 4m2 = 0

Solving for variable 'm'.

Factor a trinomial.
(-3 + -4m)(7 + -1m) = 0

Subproblem 1
Set the factor '(-3 + -4m)' equal to zero and attempt to solve:

Simplifying
-3 + -4m = 0

Solving
-3 + -4m = 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 + -4m = 0 + 3

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

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

Divide each side by '-4'.
m = -0.75

Simplifying
m = -0.75
Subproblem 2
Set the factor '(7 + -1m)' equal to zero and attempt to solve:

Simplifying
7 + -1m = 0

Solving
7 + -1m = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1m = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1m = 0 + -7
-1m = 0 + -7

Combine like terms: 0 + -7 = -7
-1m = -7

Divide each side by '-1'.
m = 7

Simplifying
m = 7
Solution
m = {-0.75, 7}