From graph of the rational function, you must define in .

(I'm assuming both x-axisandy-axis are crossed at )

I start with this set-up: (because of )

(asymptote)

(because at the function cross the x-axis and is equal to zero)

(becausepoleof the function is at ).

So it comes down to4 equations with 4 unknown variables, but I've tried many times solving, and I constantly get trapped inloop(you know, where your "new" equation is actually some old ones mixed up?)!!

Where is the flaw in my logic?