The value of
Question:

The value of $\sqrt{20} \times \sqrt{5}$ is

(a) 10

(b) $2 \sqrt{5}$

(c) $20 \sqrt{5}$

(d) $4 \sqrt{5}$

 

Solution:

$\sqrt{20} \times \sqrt{5}$

$=\sqrt{2 \times 2 \times 5} \times \sqrt{5}$

$=2 \sqrt{5} \times \sqrt{5}$

$=2 \times 5$

$=10$

Hence, the correct answer is option (a).

 

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