anonymous
  • anonymous
Find the zeros of x^2+11x+18=0
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Challenge: find two numbers multiplied together gives you 18, those same two added gives you 11.
anonymous
  • anonymous
I have answer choices, and two of them are 18. so.. a) zeros:2,9 b) zeros: -2,-9
anonymous
  • anonymous
Try them (x+9)(x+2) (x-9)(x-2) Which ever expands to your original equation. First double check your numbers: does be add up to 18?

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anonymous
  • anonymous
i think its the zeros:2,9 because it also adds up to be 11
anonymous
  • anonymous
Good guess. Proof would be the good, old FOIL.

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