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nitish kumar Grade:
        

| x| >1;let y =1+x+x^2+…………to infinity then dy/dx equal to


 

8 years ago

Answers : (2)

student iit
18 Points
										

This is infinite GP where common ration x>1.


S(n)= 1(x^n-1)/(x-1)= x^n-1/x-1


Now use d(u/v)/dx formula to find the drivative.

8 years ago
Badiuddin askIITians.ismu Expert
147 Points
										

hi nitish kumar



| x| >1;


 


 y =1+x+x^2+…………to infinity


 


dy/dx =1+2x+3x2+4x3  .....................infinity


 


clearl for x>1  dy/dx tends to +infinity


 


  and for x<-1  dy/dx  tends to either + infinity or - infinity


 


Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
 We are all IITians and here to help you in your IIT JEE preparation. All the best nitish
 
 

Regards,

Askiitians Experts

Badiuddin


 


8 years ago
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