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anonymous

  • one year ago

Which are real zeroes of this function? x3 + 2x2 – 9x – 18

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  1. anonymous
    • one year ago
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    1, 2, 3 3, -3, 2 2, 3, -6 1, -1, 18 -2, 3, -3

  2. anonymous
    • one year ago
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    @aloud

  3. misty1212
    • one year ago
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    HI!!

  4. misty1212
    • one year ago
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    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

  5. anonymous
    • one year ago
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    u got this misty?

  6. anonymous
    • one year ago
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    cheat

  7. misty1212
    • one year ago
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    \[f(x)=x^3 + 2x^2 – 9x – 18\] lets try 1

  8. misty1212
    • one year ago
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    \[f(1)=1+2-9-18\]which , whatever it is, is not 0, so we can eliminate any answer with 1 init

  9. misty1212
    • one year ago
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    @aloud yeah i think so

  10. misty1212
    • one year ago
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    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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