JAMB - Mathematics (2010 - No. 44)
Evaluate \(\int^{2}_{0}(x^3 + x^2)\)dx.
4\(\frac{5}{6}\)
6\(\frac{2}{3}\)
1\(\frac{5}{6}\)
2\(\frac{5}{6}\)
ব্যাখ্যা
\(\int^{2}_{0}(x^3 + x^2)\)dx = \(\int^{2}_{0}\)(\(\frac{x^4}{4} + {\frac {x^3}{3}}\))
= (\(\frac{2^4}{4} + {\frac {2^3}{3}}\)) - (\(\frac{0^4}{4} + {\frac {0^3}{3}}\))
= (\(\frac{16}{4} + {\frac {8}{3}}\)) - 0
= \(\frac{80}{12}
= {\frac {20}{3}}\) or 6\(\frac{2}{3}\)
= (\(\frac{2^4}{4} + {\frac {2^3}{3}}\)) - (\(\frac{0^4}{4} + {\frac {0^3}{3}}\))
= (\(\frac{16}{4} + {\frac {8}{3}}\)) - 0
= \(\frac{80}{12}
= {\frac {20}{3}}\) or 6\(\frac{2}{3}\)