X^2 -2XY +Y^2=36 so X-Y =?
My solution:(Not so sure...)
X^2 -2XY +Y^2=(X - Y)^2
Therefore, (X - Y)^2=36 So, X-y=6
But it is also a choice question and here are the choices:
+-6 (Postive or negative six) (could it be?)
Thank you in advance!