Question

the square root of 72 ×square root of 78 (1) 42 (2) 84 (3) 64 (4) 74​

Answer 1

Answer:

(4) Approx 74

Step-by-step explanation:

Question:

$\sqrt{72} \times \sqrt{78} = |?| \\ soln \\ \sqrt{6 \times 6 \times 2} \times \sqrt{39 \times 2 \times 2 \times \frac{1}{2} } \\ 6 \sqrt{2} \times 2 \sqrt{ \frac{39}{2} } \\ 6 \times 2 \sqrt{2 \times \frac{39}{2} } \\ 12 \sqrt{39 } \\ 74.94$