anonymous
  • anonymous
help How can x2 = x2 + 2x + 9 be set up as a system of equations? A) y = x2 − 9 y = x2 + 2x + 9 B) y = x2 y = x2 + 2x + 9 C) y = x2 + 2x y = x2 + 9 D) y = x2 y = 2x + 9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@zepdrix
anonymous
  • anonymous
x2 means x^2
zzr0ck3r
  • zzr0ck3r
Any ideas?

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anonymous
  • anonymous
no not at all
anonymous
  • anonymous
I was thinking option B but I'm not sure
zzr0ck3r
  • zzr0ck3r
The way you can check, is by setting each equation in the system equal to each other and see if you get the above equation Example: The first one y = x2 − 9 y = x2 + 2x + 9 Set them equal x^2-9=x^2+2x+9 This is not what we started with, so it is not the answer.
zzr0ck3r
  • zzr0ck3r
You are right, but now do you understand why?
anonymous
  • anonymous
yes I do :)
anonymous
  • anonymous
so letter B is the correct answer
zzr0ck3r
  • zzr0ck3r
yep
zzr0ck3r
  • zzr0ck3r
if you set them equal, you get the thing you started with.

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