Question

x+y=9 and xy =20 find the valve of x-y​

Answer 1

x+y=9

x=5,y=4

5+4=9

xy=20

5×4=20

x-y

5-4=1

Answer 2

Answer:

(x+y)^2=(x-y)^2+4xy

81=(x-y)^2+80

(x-y)^2=1

x-y=+ and - root 1