y+y^2+(y+y)^2= ?

Question

a. y^2 + 5y
b. 2y^2 + y
c. 3y^2 + y
d. 5y^2 + y
e. 4y^4 + y^2 + y

please answer and explain

Answer 1

y+y^2+(y+y)^2
= y + y^2 + (2y)^2
= y + y^2 + 4y^2
= y + 5y^2

d)

Answer 2

thank you, Reiny