Single Choice

Express as a mixed surd: $$\sqrt{80}$$

A$$6400$$
B$$4\sqrt{5}$$
Correct Answer
C$$5\sqrt{4}$$
D$$40$$

Solution

A surd having a rational co-efficient other than unity is called a mixed surd.

$$\sqrt{80}= \sqrt{4^2\times 5}=\sqrt{4^2}\times \sqrt{5}= 4\sqrt{5}$$

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