Question

If x-y =4 and x2+y2=80 find xy

Answer 1

check the attachment

hope it will be helpful for you

Answer 2

Answer:

32

Step-by-step explanation:

x-y=4

x^2+y^2=80

(x-y)^2=x^2+y^2-2xy

4^2=80-2xy

16=80-2xy

2xy=80-16

2xy=64

xy=32