Contact us
Choose a category below so we can get back to you as quickly as possible.
∵x(y-1)-y(x-1)=4,∴xy-x-xy+y=4,∴y-x=4,∴x-y=-4,∴x2+y22−xy=(x−y)22=(−4)22=8.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.