Question 89245


   what are the non-permissible values of the rational expression 4xy/4x^2y^2?
a. x=0 and y=1
b. x=0 and y=0
c. x=4 and y=-1
d. x=2 and y=-2


     On simplification the given expression becomes 1/4xy 

       hence if x=0   or y= 0 1/xy is not defined  therefore (a)   and (b) 
         are nonpermissible values