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anonymous

  • 5 years ago

Find all of the critical numbers for the function f(x) = x^3 – 8x^2 + 11x + 20

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  1. amistre64
    • 5 years ago
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    critical numbers eh.... no interval to worry about?

  2. amistre64
    • 5 years ago
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    f'(x) gives us some good numbers...

  3. amistre64
    • 5 years ago
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    f'(x) = 3x^2 -16x +11 now make this equal to zero to determine our critical numbers...

  4. amistre64
    • 5 years ago
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    16 +- sqrt(16^2 -(4)(11)(3)) ------------------------- 2(3)

  5. amistre64
    • 5 years ago
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    16 +- 2sqrt(31) ------------- if I did it right 6

  6. amistre64
    • 5 years ago
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    you should have an inflection point at -16/6 thats critical as well

  7. anonymous
    • 5 years ago
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    Okay I understand now, you used the quadratc equation,right?

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