plss answer fast..urgent..

plss answer fast..urgent.. 14)ln the polynomial p(x) = x2 + 6x + k. a) If k = -10, prove that p(x) can be written as the product of two first degree polynomials. b) If k = 10, prove that p (x) cannot be written as the product of two first degree polynomials. c) What is the largest number 'k' for which p (x) can be written as the product of two first degree polynomials plss answer the c part of the question