Using P2(x,y), find a quadratic approximation to ln(1.25) to 4 decimal places. The original function is f(x,y)=ln(x2 + y2) and is about the point (1,0). I calculated P2 to be y2-x2+4x-3 however I don't know how to find a quadratic approximation. Do I just set say x=1 and y=.5? Any help would be great!