Hello,

I have a question about simplifying this expression:

Here is my progress, but i cannot seem to get the answer --> x'y'

(x+y)'(x'+y')

= (x'y') (x'+y')

= (x'y' * x') + (x'y' * y')

= (x''y') + (x'y'')

= (xy') + (x'y)

= ........................

Where have i gone wrong ?

Thanks.