Question

if x+1/x =7 ,then find value of x^3+1/x^3

Answer 1

refer the attachment

hence your answer is 322

hope it helps

Answer 2

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here is your answer. ...
x+1/x=7

x^3+1/x^3=(x+1/x)^3-3x.1/x (x+1/x)
=(x+1/x)^3-3 (x+1/x)
=(7)^3-3.7
=7 (7^2-3)
=7 (49-3)
=7.46=322



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