1.

Please solve this fastly

Answer»

X-1/x=5
cubing in both the SIDES
(x-1/x)3=(5)3
=x3-1/x3-3.x.1/x(x-1/x)=125
=x3-1/x3-3×5=125
=x3-1/x3=125+15
x3-1/x3= 140





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