Question

if x+y = 8 and x^2+y^2 = 34 then x*y will be

Answer 1

Answer: 15

Step-by-step explanation:

(x+y)=8

(x²+y²)=34

(x+y)²=8²

⇒x²+y²+2xy=64

⇒34+2xy=64

⇒2xy=64-34=30

⇒xy=15