= O EXPONENTS AND POLYNOMIALS Factoring a quadratic by the ac-method Factor by grouping (sometimes called the ac-method). 5x +22x+8 First, choose a form with appropriate signs. Then, fill in the blanks with numbers to be used for grouping. Finally, show the factorization. Form: Х 5 2 ? 5x + * + * + 8 5x + [- + 8 O - 2 5x O x osx?- 0 - - 0 + 8 Factorization: 0