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Q.

The function f(x) is defined as f(x) = max {4x2,|x2|,(x2)1/3}  for x[2,4] . If the area bounded by the curve and x–axis is A, then the value of 4A=___________

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answer is 59.

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Detailed Solution

Question Image

y=4x2  is a parabola EMA.
y=|x2|  is a pair of straight lines ABF and ACD.
y=(x2)1/3  is the curve IHABG.
Thus from the graph
f(x)=max{4x2,|x2|,(x2)1/3}  is
 f(x)={2xif2x<14x2if1x<2(x2)1/3if2x<3x2if3x4
Now area bounded by the curve and x–axis
21(2x)dx+12(4x2)dx+23(x2)1/3dx+34(x2)dx
[2xx22]21+[4xx33]12+[34(x2)4/3]23+[x222x]34
=72+9+34+32=594 sq. units
 

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