Question

solve this problem fast today is my exam

Answer 1

If x+1/x =7 then find the value of x3+1/x3 x + 1/x = 7 Cubing on both sides, (x + 1/x)3 = (7)3 x3 + 1/x3 + 3 × x × 1/x × (x + 1/x) = 343 x3 + 1/x3 + 3(7) = 343 x3 + 1/x3 + 21 = 343 x3 + 1/x3 = 343 - 21 x3 + 1/x3 = 322 Therefore, the value of (x + 1/x)3 is 322.

Answer 2

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