Correct Answer: Option C

Explanation

\(\sqrt{30}\) × \(\sqrt{40}\)

= \(\sqrt{(30 × 40)}\)

\(\sqrt{(3 × 10 × 4 × 10)}\)

\(\sqrt{(400 × 3)}\)

\(\sqrt{400}\) × \(\sqrt{3}\)

20 × \(\sqrt{3}\)

20\(\sqrt{3}\)

There is an explanation video available below.

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