The question is:
Which of the following polynomials is NOT a perfect square trinomial?
A) x2 + 2x + 1
B) 4x2 - 4x + 1
C) x2 + 3x + 9
D) 16x2 + 8x + 1
E) all of them are perfect square trinomials
the way it is explained in my lesson is very confusing. I am very confused. please help me!