8m^2-1=639

Solution for 8m^2-1=639 equation:

Simplifying
8m2 + -1 = 639

Reorder the terms:
-1 + 8m2 = 639

Solving
-1 + 8m2 = 639

Solving for variable 'm'.

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

Add '1' to each side of the equation.
-1 + 1 + 8m2 = 639 + 1

Combine like terms: -1 + 1 = 0
0 + 8m2 = 639 + 1
8m2 = 639 + 1

Combine like terms: 639 + 1 = 640
8m2 = 640

Divide each side by '8'.
m2 = 80

Simplifying
m2 = 80

Take the square root of each side:
m = {-8.94427191, 8.94427191}