Which among the following is not a factor of 4y(y+3)?
4
4y(y+3) can be written as 4×y×(y+3)=4y×(y+3)=4(y+3)×y=4×y(y+3)
y(y+3) is a factor of 4y(y+3)
also, 4(y+3) is a factor of 4y(y+3).
On the other hand,
4y(y+3)=4y2+12y
So, 4y2 is a term when 4y(y+3) is expanded but not a factor.