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Find \(\int (2+x)x\sqrt{x} dx\).(a) \(\frac{4x^{5/2}}{5}+\frac{2x^{7/2}}{9}+C\)(b) \(\frac{4x^{5/2}}{5}-\frac{2x^{7/2}}{7}+C\)(c) \(\frac{4x^{5/2}}{6}+\frac{2x^{7/2}}{7}+C\)(d) –\(\frac{4x^{5/2}}{5}+\frac{2x^{7/2}}{7}+C\)This question was addressed to me in homework.This intriguing question comes from Integration as an Inverse Process of Differentiation in section Integrals of Mathematics – Class 12

Answer»

Correct ANSWER is (c) \(\FRAC{4x^{5/2}}{6}+\frac{2x^{7/2}}{7}+C\)

The BEST explanation: To FIND \(\int (2+x)x\sqrt{x} dx\)

\(\int \,(2+x)x\sqrt{x} \,dx=\int \,2x\sqrt{x}+x^{5/2} \,dx\)

\(\int \,(2+x)x\sqrt{x} \,dx=\int \,2x^{3/2} dx + \int x^{5/2} dx\)

\(\int \,(2+x)x\sqrt{x} \,dx=\frac{2x^{3/2+1}}{3/2+1}+\frac{x^{5/2+1}}{5/2+1}\)

\(\int \,(2+x)x\sqrt{x} \,dx=\frac{4x^{5/2}}{5}+\frac{2x^{7/2}}{7}+C\)



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