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