Question

if x-y=5,x y = 84 find x+y​

Answer 1

Step-by-step explanation:

x - y = 5

xy = 34.

(x−y)2=x2+y2−2xy=25

x2+y2−2×84=25

x2+y2=193

also, (x+y)2=x2+y2+2xy

=193+84×2

= 361

x+y=361=14