Question 4

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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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