So we have three functions graphed. and we have some options. What is the question?
Which function has all real numbers as its domain?
|dw:1441509316845:dw|Domain corresponds to your input values, your x's.
Which function spans aaaaaall the way to the left and right?
I'll tell you that it's not g(x). Notice that g(x) goes from an x-value of around -2 up to as large as around 1 and a half
Well notice that it can't be g(x) because g(x) has points where it `ends`. We need a function that keeps on going in both directions. So which one does that? F or P?
P(X) i think that's the one
Hmm P(x) has end points as well, that's no bueno. It doesn't extend in both directions forever and ever.
yay good job :O