Question

Xy=18 and x2 + y2=85 find x-y

Answer 1

Answer:

we know that,

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

➡85=(x-y)^2+2.18

➡(x-y)^2+36=85

➡(x-y)^2=85-36

➡(x-y)=$\sqrt{49}$

➡x-y=7