Question

if x+1/x = 7 then x cube + 1 / x cube = ​

Answer 1

Answer:

given, x + 1/x = 7  ____1

cubing both sides,

x^3 + 3(x)(1/x)(x+1/x) + (1/x)^3 = 7^3

x^3 + 3(x+1/x) + 1/x^3 = 343

x^3 + 3(7) +1/x^3 = 343        [By 1]

x^3 + 21 + 1/x^3 = 343

Thus, x^3 + 1/x^3 = 343-21 = 322

HOPE MY ANSWER HELPED!!

Answer 2

Answer:

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