Question

$4\sqrt{63}$

Explanation:

Step1: Factor 63 into perfect square

$63 = 9 \times 7$

Step2: Split the square root

$4\sqrt{63} = 4\sqrt{9 \times 7} = 4 \times \sqrt{9} \times \sqrt{7}$

Step3: Simplify $\sqrt{9}$

$\sqrt{9} = 3$, so $4 \times 3 \times \sqrt{7}$

Step4: Multiply the constants

$4 \times 3 = 12$

Answer:

$12\sqrt{7}$