Algebra 1 (Polynomials Question)

Question

I don't understand this at all please help!

So the four equations are :

A: (2x+1)(x+5)

B: (x^2+1)(x+5)

C: (t+1)(t+5)

D: x(x+5)

And we have to answer: I think that expression ------ doesn't belong because and Expression ----- also doesn't belong because -----

Thank you so much!

Answer 1

Of those four equations, three of them will be quadratic equations (where the highest level is a squared term) and one of them will be a cubic equation (where the highest level is a cubed term). I think that's why B doesn't belong in that list.