anonymous
  • anonymous
Which are real zeroes of this function? x3 + 2x2 – 9x – 18
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
1, 2, 3 3, -3, 2 2, 3, -6 1, -1, 18 -2, 3, -3
anonymous
  • anonymous
misty1212
  • misty1212
HI!!

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misty1212
  • misty1212
since you have choices, you could check them plug in the numbers and see which ones give you zero or you could cheat which is a lot easier
anonymous
  • anonymous
u got this misty?
anonymous
  • anonymous
cheat
misty1212
  • misty1212
\[f(x)=x^3 + 2x^2 – 9x – 18\] lets try 1
misty1212
  • misty1212
\[f(1)=1+2-9-18\]which , whatever it is, is not 0, so we can eliminate any answer with 1 init
misty1212
  • misty1212
@aloud yeah i think so
misty1212
  • misty1212
ok now the cheat method http://www.wolframalpha.com/input/?i=x%5E3+%2B+2x%5E2+%E2%80%93+9x+%E2%80%93+18

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