If x^2 + y^2 = 20 and xy = 3, then (x − y)^2 =	Options
A) 8  B) 11  C) 14  D) 17  E) 20
but you cannot take xy+ 3 to mean xy=-3..   only if xy+3=0, it will mean xy=-3..   rest your solution is perfect and you will get your correct answer as 20-2*3=14..   Answer 14
<result>C</result>
If x^2 + y^2 = 20 and xy = 3, then (x − y)^2 =