JAMB - Mathematics (2007 - No. 26)

Evaluate \(\frac{(0.5625)^2 - (0.4375)^2}{0.04}\) correct to three significant figures
3.11
3.13
0.313
3.12

Explanation

\(\frac{(0.5625)^2) -  (0.4375)^2}{0.04}\)
\(\frac{(0.5625 + 0.4375)(0.5625 - 0.4375)}{0.04}\)
\(\frac{1.000\times 0.125}{0.04}\)
= 3.125
= 3.13

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