r^2-f^2=

Solution for r^2-f^2= equation:

Simplifying
r2 + -1f2 = 0

Reorder the terms:
-1f2 + r2 = 0

Solving
-1f2 + r2 = 0

Solving for variable 'f'.

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

Add '-1r2' to each side of the equation.
-1f2 + r2 + -1r2 = 0 + -1r2

Combine like terms: r2 + -1r2 = 0
-1f2 + 0 = 0 + -1r2
-1f2 = 0 + -1r2
Remove the zero:
-1f2 = -1r2

Divide each side by '-1'.
f2 = r2

Simplifying
f2 = r2

Take the square root of each side:
f = {-1r, r}