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Q.

Let f(x) be a function satisfying f'(x)=f(x) and f(0) = 2. Then f(x)3+4f(x)dx=

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a

14log(3+8ex)+c

b

14log(3+5ex)+c

c

14log(3+4e2x)+c

d

14log(3+3ex)+c

answer is A.

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Detailed Solution

f'(x)=f(x)    f(x)=kex   f(0)=2k=2 

f(x)=2ex       

  f(x)3+4f(x)dx=2ex3+4.2exdx             Let t=3+8ex dt=8exdx    2exdx=dt4       

                              =14dtt          

                             =14log|t|+c

 

 

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