BALLZACK413GO BALLZACK413GO Mathematics Answered Factor x ^ 3 - 4x ^ 2 + 7x - 28 by grouping. What is the resulting expression? O (x ^ 2 + 7)(x - 4) O (x ^ 2 - 7)(x + 4) O (x ^ 2 + 4)(x - 7) O (x ^ 2 - 4)(x + 7)