Correct Answer: Option A

Explanation

\((\sqrt{0.7} + \sqrt{70})^{2}\)

= \((\sqrt{0.7} + \sqrt{70})(\sqrt{0.7} + \sqrt{70})\)

= \(0.7 + 2\sqrt{0.7 \times 70} + 70\)

= \(0.7 + 14 + 70 \)

= 84.7

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