anonymous
  • anonymous
The graph of which quadratic equation is shown below? y = x^2 + 2x − 8 y = x^2 − 2x − 8 y = −x^2 − 2x + 8 y = −x^2 − 4x − 8
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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anonymous
  • anonymous
@Notamathgenius
Notamathgenius
  • Notamathgenius
Hmm not sure D:

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anonymous
  • anonymous
Does the graph of x^2 open up or down? How about -x^2? :)
cwrw238
  • cwrw238
as its -x^2 it will be open downwards like C and D
anonymous
  • anonymous
f(x) + C will affect the position on the y axis. Take this fact into consideration.
cwrw238
  • cwrw238
yup the intercept on y-axis is when x = 0
anonymous
  • anonymous
|dw:1368631726428:dw| can you find the x -intercepts?
anonymous
  • anonymous
you should know the answer from this
anonymous
  • anonymous
I dont
anonymous
  • anonymous
ok, set everything I drew above to zero, that is like saying: When is Y zero? When Y is zero it touches the x-axis
anonymous
  • anonymous
it is zero when x = 2 and when x = -4
anonymous
  • anonymous
So the answer is...?
anonymous
  • anonymous
So then the answer is y = −x^2 − 2x + 8 I factored out the negative sign above.
anonymous
  • anonymous
look at your graph, it's consistent with this
anonymous
  • anonymous
Make sense? :)
anonymous
  • anonymous
lol, just looking for someone to do your homework without effort, eh?

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