Question

which of the following equations represents a quadratic function

Answer 1

What do you think a quadratic equation is or just what does it have?

Answer 2

B?

Answer 3

Again, you need to explain how you get your answers--or else you're probably just guessing.

Answer 4

there's a square root

Answer 5

Are you thinking of the quadratic equation, since that has a sq root in it?

Answer 6

See if you'll get closer with this:
https://www.augustatech.edu/math/molik/graphingquadsCA.pdf

Answer 7

it's not b, i don't think a quadratic function can have radical signs

Answer 8

Do you have another idea--with new evidence HugoHuynh?

Answer 9

D

Answer 10

But WHY?!

Answer 11

Why not A?

Answer 12

cuz I think the even #

Answer 13

Good enough. And yes, D.
http://en.wikipedia.org/wiki/Quadratic_function
All quadratics are even degrees. Here you can see how similar they are:
http://en.wikipedia.org/wiki/Quadratic_function#Graph_of_the_univariate_function