Question

Which of the following statements are true of the discriminant?

Answer 1

The ones you can throw out are
B (second one down) E

By a very slim margin (like the thickness of a piece of paper), you could take out C. Technically, it is the value under the root sign which means you find b^2 and subtract 4ac from it. Your teacher may not agree. It is a very thin definition.

So what are we left with? Unfortunately A and D are both correct. 
Answer AD and 1/2 of C <<<< answer.

Answer 2

Statements 1, 3, and 4 are true.

_____
Statements 3 and 4 say the same thing: "radicand" ≡ "value under the radical".