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check my precalc

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#1. Make up a polynomial that has the following characteristics:
crosses the x axis at 1 and 4, touches the x axis at 0 ad 2. and is above the xaxis between 0 and 2.

I did (x+1)(x-4)(x^2)(x-2)^2

#2. its an illustration but one of the queestino says what is the minimum degree of polynomial. How do I find that and how do I find the maximum nuber of turnin points. I know it has to do with n-1 but Idont know how.


  • check my precalc -

    should be (x-1)(x-4) to cross at 1 and 4
    should be x^2 and (x-2)^2 to touch at 0 and 2

    The last part confuses me. Since it crosses at x=1, how can it be positive for 0<x<2?

    Or, on the other hand, since it crosses at x=1, it must be positive somewhere between 0 and 2.

    Or, assuming your (x+1) factor is correct, then it shopuld have crossed at -1, not 1, and we have to consider how to make it positive for 0<x<2.

    So, since we have

    (x+1) x^2 (x-2)^2 (x-4)
    for 0<x<2, all the factors except (x-4) are positive. So, try

    -(x+1) x^2 (x-2)^2 (x-4)

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