Question

if x +1/x = 7, then x^3 +1/x^3=​

Answer 1

x^3+1/x^3=

(x+1/x)^3 - 3(x+1/x)

substituting the given information

7^3-3(7)

343-21

322

Answer 2

Step-by-step explanation:

See the pic.

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