1) (y+2)^2 + 2(y+1)(y+4)= (y^2 + 4y + 4) + 2(y^2 + 5y + 4)= y^2 + 4y + 4 + 2y^2 + 10y + 8= 3y^2 + 14y + 12
2) (u+2)^3 - u(u+4)= (u^3 + 6u^2 + 12u + 8) - (u^2 + 4u)= u^3 + 6u^2 + 12u + 8 - u^2 - 4u= u^3 + 5u^2 + 8u + 8
3) -(a+2)^3 - (a-2)a= -((a^3 + 6a^2 + 12a + 8) - (a^2 - 2a))= -(a^3 + 6a^2 + 12a + 8 - a^2 + 2a)= -a^3 - 6a^2 - 12a - 8 + a^2 - 2a= -a^3 - 5a^2 - 14a - 8
1) (y+2)^2 + 2(y+1)(y+4)
= (y^2 + 4y + 4) + 2(y^2 + 5y + 4)
= y^2 + 4y + 4 + 2y^2 + 10y + 8
= 3y^2 + 14y + 12
2) (u+2)^3 - u(u+4)
= (u^3 + 6u^2 + 12u + 8) - (u^2 + 4u)
= u^3 + 6u^2 + 12u + 8 - u^2 - 4u
= u^3 + 5u^2 + 8u + 8
3) -(a+2)^3 - (a-2)a
= -((a^3 + 6a^2 + 12a + 8) - (a^2 - 2a))
= -(a^3 + 6a^2 + 12a + 8 - a^2 + 2a)
= -a^3 - 6a^2 - 12a - 8 + a^2 - 2a
= -a^3 - 5a^2 - 14a - 8