x^2 - 16 x^2 + 5x + 4
__________ ÷ ___________
x^2 + 5x + 6 x^2 - 2x - 8
(x + 4) (x - 4) (x + 1) ( x + 4)
____________ ÷ ___________
(x + 3) ( x + 2) (x - 4) ( x + 2) invert the second faction and multiply
(x + 4) ( x - 4) (x - 4) ( x + 2)
______________________
(x + 3) ( x + 2) (x + 1) (x + 4)
(x - 4)^2
____________ x cannot be -3, -2, 4, -1, -4
(x + 3) ( x + 1)
Third answer