Let be the function given by f(x)= x+12/x^2+25x+156
Part A: Graph the function using graphing technology. What is an appropriate horizontal scale and vertical scale for the viewing window?
Part B: Find lim f(x) as x approaches c or explain why lim f(x) as x approaches c does not exist for each of the values c= -12,-13, and -14. Make sure to include reasoning using correct limit notation.