posted by Bryant on .
alright i approached this at y=0. and got the limit as 3. where else can i approach this from to see if the limit really exist which im hoping it doesn't. i tried y=x-1 and that was a mess and i also tried y=mx which did nothing.
Hmmm. . . Looks like a removable singularity to me.
x^3 - 1 = (x-1)(x^2 + xy + y^2)
= x(x+y)^2 - (x+y)^2
so, f(x,y) = (x^2+xy+y^2)/(x+y)^2 for x≠1
limit as (x,y) -> (1,0) = (1)/(1)^2 = 1