Answer: Choice B
Step-by-step explanation:
At first glance, it doesn't appear that choice B is quadratic. But we can rearrange things like so

This is quadratic because the largest exponent here is "2".
It fits the template
where a = 1, b = -1, c = 0.
Extra info:
- Choices A and D are linear since they can be rearranged into the format of
(aka slope-intercept form). - Choice C is an exponential function. This is due to the fact the variable x is in the exponent.
- If you're ever stuck, then graphing is a good way to go. Desmos and GeoGebra are two graphing tools I recommend. Choices A and D can be ruled out since they graph out straight lines. Choice C is ruled out because it's an exponential curve that goes up forever. Quadratic curves are parabolic bowl shapes.