9=f^2

Solution for 9=f^2 equation:

Simplifying
9 = f2

Solving
9 = f2

Solving for variable 'f'.

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

Add '-1f2' to each side of the equation.
9 + -1f2 = f2 + -1f2

Combine like terms: f2 + -1f2 = 0
9 + -1f2 = 0

Add '-9' to each side of the equation.
9 + -9 + -1f2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1f2 = 0 + -9
-1f2 = 0 + -9

Combine like terms: 0 + -9 = -9
-1f2 = -9

Divide each side by '-1'.
f2 = 9

Simplifying
f2 = 9

Take the square root of each side:
f = {-3, 3}