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Question

Evaluate : 22x21+5xdx.

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Solution

22x21+5xdx......(i) [baf(x)dx=baf(a+bx)dx]

I=22(2+2x)21+52+2xdx=22x21+5xdx....(ii)

Adding (i) and (ii), 2I=22x2dx=13[x3]22=13[8+8] I=83.


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