21+m-20m^2=0

Solution for 21+m-20m^2=0 equation:

Simplifying
21 + m + -20m2 = 0

Solving
21 + m + -20m2 = 0

Solving for variable 'm'.

Factor a trinomial.
(21 + -20m)(1 + m) = 0

Subproblem 1
Set the factor '(21 + -20m)' equal to zero and attempt to solve:

Simplifying
21 + -20m = 0

Solving
21 + -20m = 0

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

Add '-21' to each side of the equation.
21 + -21 + -20m = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -20m = 0 + -21
-20m = 0 + -21

Combine like terms: 0 + -21 = -21
-20m = -21

Divide each side by '-20'.
m = 1.05

Simplifying
m = 1.05
Subproblem 2
Set the factor '(1 + m)' equal to zero and attempt to solve:

Simplifying
1 + m = 0

Solving
1 + m = 0

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

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

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

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

Simplifying
m = -1
Solution
m = {1.05, -1}