anonymous
  • anonymous
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Mathematics
chestercat
  • chestercat
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mathmate
  • mathmate
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.
anonymous
  • anonymous
Would I FOIL?
mathmate
  • mathmate
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.

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mathmate
  • mathmate
You don't need to foil. It's easier when factored, see "hints continued".
anonymous
  • anonymous
Would it be B then? since they're both x-...?

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