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→3​x−3x2−9​. limx→3​x−3x2−9​= (Type an integer or a decimal.)