dinainjune
if x + 1/x = 5
how about
x^3 + 1/ x^3 ?



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saifoo.khan
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o.O

dinainjune
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the question is this \[x^{3} + 1/ x^{3}\]

him1618
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cube x + 1/x

him1618
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(x + 1/x )^3 = 125 = x^3 + 1/x^3+ 3x + 3/x
125 = x^3 + 1/x^3 + 3(x+1/x)
125 = x^3 + 1/x^3 +15
hence
x^3 + 1/x^3 = 110

dinainjune
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cube ?

dinainjune
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Thanks !