JAMB - Mathematics (2002 - No. 4)
Simplify \((\sqrt{0.7} + \sqrt{70})^{2}\)
84.7
70.7
217.7
168.7
説明
\((\sqrt{0.7} + \sqrt{70})^{2}\)
= \((\sqrt{0.7} + \sqrt{70})(\sqrt{0.7} + \sqrt{70})\)
= \(0.7 + 2\sqrt{0.7 \times 70} + 70\)
= \(0.7 + 14 + 70 \)
= 84.7