Mark (✓) against the correct answer

Question:

Mark (✓) against the correct answer

$\sqrt{72} \times \sqrt{98}=?$

(a) 42

(b) 84

(c) 64

(d) 74

Solution:

(b) 84

$\sqrt{72} \times \sqrt{98}=\sqrt{2 \times 2 \times 2 \times 3 \times 3} \times \sqrt{2 \times 7 \times 7}=\sqrt{2 \times 2 \times 2 \times 3 \times 3 \times 2 \times 7 \times 7}=2 \times 2 \times 3 \times 7=84$

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