Let f(x)=x−3x2−9 (a) Calculate f(x) for each value of x in the following table. (a) Calculate f(x) for each value of x in the following table. (Type an integer or decimal rounded to four decimal praces as wevded.) (b) Make a conjecture about the value of limx→3x−3x2−9. limx→3x−3x2−9= (Type an integer or a decimal.)