Question

If p+q=10 and pq =21, find 3 (p^2 + q^2).​

Answer 1

Step-by-step explanation:

Given p + q = 12.

On cubing both sides, we get

(p + q)^3 = (12)^3

p^3 + q^3 + 3pq( p +q) = 1728

p^3 + q^3 + 3 * 27(12) = 1728

p^3 + q^3 + 972 = 1728

p^3 + q^3 = 1728 - 972

p^3 + q^3 = 756.

Answer 2

this is your answer

hope this helps you