Question

(y^2-6y+8) (y+2)

Answer 1

(y^2 - 6y + 8) (y + 2)
= (y^2 - 6y + 8) (y) + (y^2 - 6y + 8) (2)
= (y^3 - 6y^2 + 8y) + (2y^2 - 12y + 16)
= y^3 - 6y^2 + 2y^2 + 8y - 12y + 16
= y^3 + (- 6 + 2 ) y^2 + (8 - 12) y + 16
= y^3 - 4y^2 - 4y + 16