Mia is factoring the polynomial x2 + 4x – 12. she uses the steps shown. x^2+4x-12 step 1- x^2 + 6x - 2x - 12 step 2- (x^2 + 6x) - (2x - 12) step 3- x(x + 6) -2 (x+6) step 4- (x + 6) (x+2) in which step did mia make an error? a. step 1 b. step 2 c. step 3 d. step 4