Select ALL characteristics of a perfect square trinomial?
Select 4 correct answer(s)

1 first term must be a perfect square

2 Middle term must be a perfect square

3 Last term must be a perfect square

4 Middle term must be two times the square root of the first term times the square root of the last term

5 All signs must be positive

6 All signs must be negative

7 The last term cannot be negative

8 The middle term cannot be negative