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anonymous

  • 5 years ago

y=(-50x^3)+(10x^2)+150x+250 find the positive interval, negative interval, increasing and decreasing intervals 11:33 pm

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  1. anonymous
    • 5 years ago
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    To find the increasing and decreasing intervals, you have to find f'(x), which means the critcal points then make a table and plug them in , so : x (-) 0 (+) and plug in the critical numbers _______________________________________________ f(x) ________________________________________________ f'(x) then substitute some values of x in the original function. if you get a - answer then f'(x) is decreasing, if you get a + answer then f'(x) is increasing, and when you're done you can compute the intervals of increasing and decreasing. It would be alot easier if I show it to you by hand lol, Hope this helps ^_^

  2. anonymous
    • 5 years ago
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    That sounds hard

  3. anonymous
    • 5 years ago
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    LOL, believe me it's easier than you think.

  4. anonymous
    • 5 years ago
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    i got f<2.36 for the positive

  5. anonymous
    • 5 years ago
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    find the critical numbers, plug them in the table, then plug in some other negative numbers in the left, and positive numbers in the right. After that , plug them in f(x) to see what value we get, then write it in the f(x) row. If your answer is positive, then write in f'(x)'s row , increase and vice versa ^_^

  6. anonymous
    • 5 years ago
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    it's positive, so f'(x) is increasing ^_^

  7. anonymous
    • 5 years ago
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    ok what are the critical numbers

  8. anonymous
    • 5 years ago
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    to know that you have to computer f'(x) :)

  9. anonymous
    • 5 years ago
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    the x-intercept is 2.36 y intercept is 250 relative max is (1.06, 360.6) and relative min is (-.93, 159.36) now would you be able to tell me the intervals

  10. anonymous
    • 5 years ago
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    haven't worked it out yet, but when they say positive interval and negative interval isn't it the same as finding the increasing and decreasing intervals?

  11. anonymous
    • 5 years ago
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    no they are different

  12. anonymous
    • 5 years ago
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    is it finding the Absolute mx and Absolute min?

  13. anonymous
    • 5 years ago
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    no i don't think those exist for this equation

  14. anonymous
    • 5 years ago
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    I'm still not getting what you mean by positive interval and negative interval, never heard of such thing lol >_<

  15. anonymous
    • 5 years ago
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    oh. That's ok. I don't understand any of this.

  16. anonymous
    • 5 years ago
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    did you understand the increasing and decreasing intervals?

  17. anonymous
    • 5 years ago
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    Not really. I'll probably have to study that more.

  18. anonymous
    • 5 years ago
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    after figuring out whether f'(x) is increasing or decreasing, you can then say from where and where does the function increase or decrease

  19. anonymous
    • 5 years ago
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    yes!

  20. anonymous
    • 5 years ago
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    oh well.

  21. anonymous
    • 5 years ago
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    lol, I wish I was there to draw it for you, it'll be alot more clearer than just typing it down . I'm sorry

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