To solve for \( f \) in the equation
\[ f^2 = 3, \]
you need to take the square root of both sides.
The solutions will be:
\[ f = \sqrt{3} \quad \text{or} \quad f = -\sqrt{3}. \]
Therefore, the values for \( f \) are \( f = \sqrt{3} \) and \( f = -\sqrt{3} \).