Factor the polynomial twice. First use a common factor with a positive coefficient, and then use a common factor with a negative coefficient. -b^(4)+7b^(3)+6b The factorization where the common factor has a positive coefficient is -b^(4)+7b^(3)+6b=b(-b^(3)+7b^(2)+6) The factorization where the common factor has a negative coefficient is -b^(4)+7b^(3)+6b