1.

Evaluate : ∫(1 − x)√x dx.

Answer»

∫(1 − x)√x dx =

 ∫(√x − x√x) dx 

= ∫ (x \(\frac{1}{2}\) − x \(\frac{3}{2}\)) dx 

= ∫ x \(\frac{1}{2}\) − ∫ x \(\frac{3}{2}\) dx

=\(\frac{2}{3} x ^{\frac{3}{2}}\)\(\frac{2}{5} x^{\frac{5}{2}}\) + c, where C is an integral constant.

(\(\because\) ∫ xndx = \(\big(\frac{x^{n+1}}{n+1}\big)\))

Hence, ∫(1-x)√x dx = \(\frac{2}{3} x ^{\frac{3}{2}}\) - \(\frac{2}{5} x^{\frac{5}{2}}\) + c.



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