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chanda ranjan Grade: Upto college level
        

1.   if lim x3-a3/x-a =lim x4-1/x-1 ,find all possible values of a.


       x->a                  x->1



6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

lim x->a  (x3-a3)/x-a =  lim x->1  x4-1/x-1                


x3-a3=(x-a)(x2+a2+ax)       &     x4-1=(x2-1)(x2+1)=(x-1)(x+1)(x2+1)


putting these expression becomes


lim x->a   (x2+a2+ax)      =    lim x->1 (x+1)(x2+1)


      after  taking limit


          3a2 = 4


           a=(4/3)1/2


a=2/31/2 or -2/31/2

6 years ago
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