Question

Factor the polyomial completely using any method
y^4-81
Medal given for answer

Answer 1

(y^2)^2 - (9)^2 = (Y^2 - 9) (y^2+ 9)

Answer 2

further

Answer 3

Thanks medal given (:

Answer 4

(y^2)^2 - (9)^2 = (Y^2 - 9) (y^2+ 9)
= [(y)^2 - (3)^2] (y^2 + 9)
= (y-3)(y+3)(y^2 + 9)

Answer 5

pls see my final ans above......☺

thanks for the medal....