Since $\frac{2401}{2401}$ and $\frac{2176}{2401}$ have the same denominator, subtract them by subtracting their numerators.
$$\sqrt{\frac{2401-2176}{2401}}$$
Subtract $2176$ from $2401$ to get $225$.
$$\sqrt{\frac{225}{2401}}$$
Rewrite the square root of the division $\frac{225}{2401}$ as the division of square roots $\frac{\sqrt{225}}{\sqrt{2401}}$. Take the square root of both numerator and denominator.
