Question

Which of the following are quadratic functions?
http://i.imgur.com/zwLeMyV.png

Answer 1

@mikeshaw I'm wondering what you think might be the answer.

A quadratic function usually has a form (or can be put into a form) similar to this:

y = ax² + bx + c, where a≠ 0.

Answer 2

I think B and C are quadratic functions

Answer 3

C is but B is not. B is a linear function. There is no power of 2 there.

There is one more correct choice in addition to C. What is it? @mikeshaw

Answer 4

A

Answer 5

Yes, so that gives you A and C.