Please help! Medal + Fan! (easy Algebra question)

What is the domain of the following parabola?

Question

Please help! Medal + Fan! (easy Algebra question) 

What is the domain of the following parabola?

anonymous · Answer

attachment

anonymous · Answer

a. x ≥ 1
b. x ≤ 1
c. All real numbers
d. y ≤ 2

anonymous · Answer

I'm not sure what the answer is, cause I've been having trouble with determining domains. My lesson never really covered it.

freckles · Answer

the domain is all the x-values in which the function exists

freckles · Answer

look at your x-axis and scroll up and down with your eyes for each value on the x-axis
and if you see a part of the curve (line or whatever) there then the function exist and so that number is apart of the domain

freckles · Answer

for example does your function exist at x=-2?|dw:1440973842510:dw|