If x^2 + y^2 = 18 and xy = 3, then (x − y)^2 =  Choose one:	A) 8	B) 11	C) 14	D) 12	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 18-2*3=12..   Answer 12
<result>D</result>
If x^2 + y^2 = 18 and xy = 3, then (x − y)^2 =