Question

If p+1/p - 7 then find the value of p³+1/p³ ​

Answer 1

322

Explanation:

We have,

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

p+1/p=7

Now,

p^3+1/p^3=(p+1/p)^3-3*p*1/p(p+1/p)

=7^3-3(7)=343-21=322