(x-y)2 = (x-y)(x-y) = x2 -2xy + y2 = 49
Since xy = 18, we have x2 - 36 + y2 = 49
So, x2 + y2 = 85
(x-y)2 = (x-y)(x-y) = x2 -2xy + y2 = 49
Since xy = 18, we have x2 - 36 + y2 = 49
So, x2 + y2 = 85
Get a free answer to a quick problem.
Most questions answered within 4 hours.
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.