Question

multiply: (y^2+2y+3)(y^2+2y-3)

Answer 1

Answer:

y^4 + 4y^3 + 4y^2 - 9

Step-by-step explanation:

(y^2 + 2y + 3) (y^2 + 2y - 3)

= y^2(y^2 + 2y - 3) + 2y(y^2 + 2y - 3) +3(y^2 + 2y - 3)

=y^4 + 2y^3 - 3y^2 + 2y^3 + 4y^2 - 6y + 3y^2 + 6y - 9

=y^4 + 4y^3 + 4y^2 - 9