Question

http://prntscr.com/8jlzb3

Answer 1

hints:
when a parabola opens up, the leading coefficient (i.e. coefficient of x^2) is positive.
when a parabola opens down, the leading coefficient is negative.

Answer 2

Would I FOIL?

Answer 3

hints, continued:
If a parabola crosses the x-axis at two places, a and b, then
(x-a) and (x-b) are factors of the equation of the parabola.

Answer 4

You don't need to foil. It's easier when factored, see "hints continued".

Answer 5

Would it be B then? since they're both x-...?