x+ 1/x = 7, find x3 + 1/x3.
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x+1/x = 7
x³ + 1/x³ = (x+1/x)³ - 3(x)(1/x) (x + 1/x)
= 7³ - 3(7)
= 343 - 21
= 322
Hope it helps
x³ + 1/x³ = (x+1/x)³ - 3(x)(1/x) (x + 1/x)
= 7³ - 3(7)
= 343 - 21
= 322
Hope it helps
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