Question

p+q=7 and p^2+q^2=85 Find p and q​

Answer 1

ANSWER

p + q = 4 

and p2 + q2 = 7

(p + q)2 = (4)2

= 16 

⇒ p2 + q2 + 2pq = 16

⇒ 7 + 2pq = 16 

⇒ 2pq = 9 

pq = 29