anonymous
  • anonymous
What is the possible discriminant of the graph? a. –11 b. 0 c. 18 d. 36
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous
i think its d, 36. Am i right?
anonymous
  • anonymous
A graph does not have discriminant. We call discriminant to this: \[\sqrt{b^2-4ac}\]

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anonymous
  • anonymous
yea but dont u have to figure it out somehow?
anonymous
  • anonymous
this is what i did, hold on
anonymous
  • anonymous
That graph represents a quadratic function which roots depends on the value of the determinant.
anonymous
  • anonymous
x = -4 and x = 2 So, (x - 4) (x + 2) = 0 -4 * 2 = - 8 and - 4 + 2 = -2 y = x^2 - 2x - 8 b^2 - 4ac (-2)^2 - 4(1)(-8) 4 + 32 =36 Discriminate, SO you have to work backwards, am i right?
anonymous
  • anonymous
As you can see there are two different roots, and there are real numbers. So the value of the discriminant must be positive.
anonymous
  • anonymous
Exactly, you''re right!
anonymous
  • anonymous
so d?
Mertsj
  • Mertsj
yes d

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