21m^2-15=0

Solution for 21m^2-15=0 equation:

Simplifying
21m2 + -15 = 0

Reorder the terms:
-15 + 21m2 = 0

Solving
-15 + 21m2 = 0

Solving for variable 'm'.

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

Add '15' to each side of the equation.
-15 + 15 + 21m2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 21m2 = 0 + 15
21m2 = 0 + 15

Combine like terms: 0 + 15 = 15
21m2 = 15

Divide each side by '21'.
m2 = 0.7142857143

Simplifying
m2 = 0.7142857143

Take the square root of each side:
m = {-0.845154255, 0.845154255}