1. **State the problem:** We are given the equation $s = k - m^2$ and need to make $m$ the subject. 2. **Isolate the term with $m$:** Add $m^2$ to both sides and subtract $s$ from both sides to get: $$m^2 = k - s$$ 3. **Solve for $m$:** To isolate $m$, take the square root of both sides. Remember, taking the square root gives two solutions (positive and negative): $$m = \pm \sqrt{k - s}$$ 4. **Final answer:** $$m = \pm \sqrt{k - s}$$ This means $m$ can be either the positive or negative square root of $k - s$.