anonymous
  • anonymous
Find a cubic function with the given zeros. Square root of seven., -Square root of seven., -4
Mathematics
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anonymous
  • anonymous
Find a cubic function with the given zeros. Square root of seven., -Square root of seven., -4
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Vocaloid
  • Vocaloid
putting all of our zeros together, we get: f(x) = (x+sqrt7)(x-sqrt7)(x+4) all you need to do is expand that by multiplying everything out
anonymous
  • anonymous
but how

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Vocaloid
  • Vocaloid
start with (x+sqrt7)(x-sqrt7) then use the difference if squares formula (x+A)(x-A) = x^2-A^2
anonymous
  • anonymous
x^2-sqrt7^2 x^2-7
anonymous
  • anonymous
right?
Vocaloid
  • Vocaloid
good, now we tack on (x+4) (x^2-7)*(x+4) use foil to expand that
anonymous
  • anonymous
x^3+4x^2-7x-28
anonymous
  • anonymous
like that right?
Vocaloid
  • Vocaloid
excellent! now take a look at your answer choices and see which one matches
anonymous
  • anonymous
thank you

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