Jambmaths question:
Simplify ${{(\sqrt{0.7}+\sqrt{70})}^{2}}$
Option A:
84.7
Option B:
70.7
Option C:
217.7
Option D:
168.7
Jamb Maths Solution:
$\begin{align} & {{(\sqrt{0.7}+\sqrt{70})}^{2}}=(\sqrt{0.7}+\sqrt{70})(\sqrt{0.7}+\sqrt{70}) \\ & {{(\sqrt{0.7}+\sqrt{70})}^{2}}=0.7+2\sqrt{49}+70=0.7+14+70=84.7 \end{align}$
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