Question 4

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Jambmaths question: 

Evaluate $\frac{{{(0.5625)}^{2}}-{{(0.4375)}^{2}}}{0.04}$ correct to 3 significant figures

Option A: 

3.13

Option B: 

3.12

Option C: 

3.11

Option D: 

0.313

Jamb Maths Solution: 

$\begin{align}  & \frac{{{(0.5625)}^{2}}-{{(0.4375)}^{2}}}{0.04}=\frac{(0.5625-0.4375)(0.5625+0.4375)}{0.04} \\ & =\frac{0.125\times 1}{0.04}=3.125 \\ & \simeq 3.13\text{   (3s}\text{.f)} \\\end{align}$

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