if x+1/x=7, then find x^3+1/x^3
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X +1/X = 7
(X + 1/X)3 = 73
X3 + 1/X3 + 3 X (1/X) (X+ 1/X) = 343 As, ( a+ b)3 = a3+ b3+3ab(a+b)
X3+ 1/X3+ 3*7 = 343
X3+ 1/X3 =343−21
X3+ 1/X3= 322
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