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Question

Find the area of the region bounded by the curves y2=9x and y=3x.

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Solution

We have, y2=9x and y=3x

(3x)2=9x

9x29x=0

9x(x1)=0

x=1, 0

Required area, A=109xdx103xdx=310x12dx310xdx=[x3232]103[x22]10=3(230)3(120)=232=12sq units


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