If a and b are integers and a≠0 which of the following cannot equal 0?	Pick one:
A) ab B) a-b C) a+b D) ab-b^2 E) a^2+b^2
(A) ab   If b=0 , then ab=0   (B) a - b   If a=b , then a-b= =0   (C) a + b   If b=-a , then a+b=0   (D) ab - b^2   If a=b , then ab-b^2= 0   (E) a^2 + b^2   Can't be equal to zero .   If a=0 , then a^2 + b^2	=b^2   if a=-ve , then a^2 + b^2 not equal to 0   Answer a^2+b^2
<result>E</result>
If a and b are integers and a≠0 which of the following cannot equal 0?