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anonymous

  • one year ago

Math

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  1. welshfella
    • one year ago
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    can you find the derivative ?

  2. anonymous
    • one year ago
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    Yeah its -4x^3 +4x

  3. anonymous
    • one year ago
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    x = -1 x = 0 x = 1

  4. anonymous
    • one year ago
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    It can only be two of those

  5. anonymous
    • one year ago
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    x = -1 x = 1

  6. anonymous
    • one year ago
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    I think its -1 and 0 is that correct @welshfella ?

  7. amoodarya
    • one year ago
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    f'=-4(x^3-x)|dw:1435946243012:dw|

  8. amoodarya
    • one year ago
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    |dw:1435946308542:dw|

  9. welshfella
    • one year ago
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    we can take values close to the turning point when x = -1.1 derivative is positive so increasing at -0.9 derivative is negative so decreasing so its not x = -1

  10. welshfella
    • one year ago
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    - as you can see from amoodarya's table it changes from decreasing to increasing at x = 0

  11. anonymous
    • one year ago
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    So only at 0?

  12. welshfella
    • one year ago
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    rhe graph looks like |dw:1435946514408:dw|

  13. welshfella
    • one year ago
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    3 turning points

  14. welshfella
    • one year ago
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    yes

  15. welshfella
    • one year ago
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    there's a local maximum at -1 and 1 and a minimum at 0

  16. anonymous
    • one year ago
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    Okay thank you!

  17. welshfella
    • one year ago
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    yw

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