Respuesta :

y^5-y^4+y^2 I believe
y^5 - 2y^2 - y^4 + 3y^2 - y^4 = ......combine like terms
y^5 - 2y^4 + y^2 <==

however, this can be factored...not sure which one ur teacher wants..
y^2(y^3 - 2y^2 + 1) <=