Simplify \((\sqrt{0.7} + \sqrt{70})^{2}\)
A
84.7
B
70.7
C
217.7
D
168.7
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
\((\sqrt{0.7} + \sqrt{70})^{2}\)
= \((\sqrt{0.7} + \sqrt{70})(\sqrt{0.7} + \sqrt{70})\)
= \(0.7 + 2\sqrt{0.7 \times 70} + 70\)
= \(0.7 + 14 + 70 \)
= 84.7
Source: Myschool Past Questions Archive (Record #2877)