Question

Hii, brainly users
Plz.... Plz...... Solve this ques... With solution. I need it.

Answer 1

Let x + 1/x be y

Apply a^3 + b^3 = (a+b)^3 - 3ab(a+b)

According to question

A= x and b = 1/x

(Y)^3 - 3×x×1/x (y)

Y^3 - 3y

7^3 - 21

= 322

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