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anonymous

  • one year ago

Find the x-intercepts and intervals in the equation y=-x^4-5x^3+3x^2+13x=10

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  1. welshfella
    • one year ago
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    should that be + 10 at the end?

  2. anonymous
    • one year ago
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    -10.

  3. welshfella
    • one year ago
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    ok

  4. welshfella
    • one year ago
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    the by rational root theorem the roots could be +/- 1, +/-2, +/- 5 +/- 10 evaluate f(1)

  5. welshfella
    • one year ago
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    does it = 0? if so you have one of the zeros ( intercepts on x-axis)

  6. anonymous
    • one year ago
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    i got -5, -2 and 1.

  7. welshfella
    • one year ago
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    good job

  8. anonymous
    • one year ago
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    now, what is the interval?

  9. welshfella
    • one year ago
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    now there must be another root because the function is of the 4th segree

  10. welshfella
    • one year ago
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    * degree

  11. anonymous
    • one year ago
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    when use the synthetic division, i got -x+1

  12. welshfella
    • one year ago
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    it wiil be worth drawing the graph on Desmos one of the roots could have duplicity 2

  13. welshfella
    • one year ago
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    x = 1 has duplicity 2

  14. anonymous
    • one year ago
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    so, in giving the intervals, should i disregard the another 1?

  15. welshfella
    • one year ago
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    gtg right now sorry one of the other guys will be able to help

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