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Q.

The square root of $0.09 + 2 \times 0.21 + 0.49$ is

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a

$2 \sqrt{0.21}$

b

1

c

$\sqrt{0.19} + \sqrt{0.49}$

d

$0.58$

answer is C.

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Detailed Solution

$\sqrt{0.09 + 2 \times 0.21 + 0.49}$

$= \sqrt{{(0.3)}^{2} + 2 \times 0.3 \times 0.7 + {(0.7)}^{2}}$

$\Rightarrow \sqrt{{(0.3 + 0.7)}^{2}} = 1$

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