Question

x2+1/x2=79findx3-1/x3

Answer 1

HERE _/ MEANS "UNDER ROOT"



(x-1/x)^2 =x2+1/x2 -2 =79-2=77
x-1/x=_/77
cubing b/s,we get

x3-1/x3 -3(x-1/x)=77_/77
x3-1/x3-3(_/77)=77_/77
x3-1/x3=77_/77+3_/77=80_/77



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