1.

Evaluate the following definite integral:\(\int_1^2 \frac {\sqrt x}{\sqrt{3-x}+ \sqrt x}\) dx 

Answer»

Let I = \(\int_1^2 \frac {\sqrt x}{\sqrt{3-x}+ \sqrt x}\) ....(1)

∴ I = \(\int_1^2 \frac {\sqrt{(1+2-x)}}{\sqrt{3-(1+2-x)} + \sqrt{1+2-x}}dx\)

\(\int_1^2 \frac {\sqrt{3-x}}{\sqrt x + \sqrt{3-x}}dx\)

\(\int_1^2 dx = (x)_1^2\)

= 2-1 = 1

∴ I = 1/2

\(\int_1^2 \frac {\sqrt x}{\sqrt{3-x}+\sqrt x}dx = \frac 12\)



Discussion

No Comment Found

Related InterviewSolutions