MCQ
The value of $\sqrt{20} \times\sqrt{5}$ is
- ✓10
- B$2 \sqrt{5}$
- C$20 \sqrt{5}$
- D$4 \sqrt{5}$
✓
Answer
Correct option: A.
10
(a)
Using: $\sqrt{a} \times \sqrt{b}=\sqrt{a b}$, we obtain$\sqrt{20} \times \sqrt{5}=\sqrt{20 \times 5}=\sqrt{100}=\sqrt{10^2}=10$
Using: $\sqrt{a} \times \sqrt{b}=\sqrt{a b}$, we obtain$\sqrt{20} \times \sqrt{5}=\sqrt{20 \times 5}=\sqrt{100}=\sqrt{10^2}=10$
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