# How do you factor y= 3x^7 - 9x ^6 + 18x ^5 ?

Factor $y = 3 {x}^{7} - 9 {x}^{6} + 18 {x}^{5}$
$D = {b}^{2} - 4 a c = 9 - 24 = - 15 < 0.$