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Math Help - 2 Proof Questions

  1. #16
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    Quote Originally Posted by CaptainBlank View Post
    Pointing at a diagram does not constitute a proof. You will have the
    Bourbaki police after you at this rate.
    You do not need to lecture me on not using diagrams. I do not use them for proofs and I agree we cannot use them for proofs. I was making it easier for the user to understand.

    However, you can use the fact that any quadradic has a maximum with the main coefficient negative. That is what I was saying.
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  2. #17
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    Quote Originally Posted by ThePerfectHacker View Post
    You do not need to lecture me on not using diagrams. I do not use them for proofs and I agree we cannot use them for proofs. I was making it easier for the user to understand.
    You fail to detect humor in this case.

    However, you can use the fact that any quadradic has a maximum with the main coefficient negative. That is what I was saying.
    And what I am saying is that the student cannot assume that in this case
    as it is (almost) what they are being asked to proove.

    RonL
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  3. #18
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    what if i say m and n are both not even because it is the special case of elimination of common factors property.
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  4. #19
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    how did u get k<=13 and i got k <= -5
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  5. #20
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    Quote Originally Posted by ruprotein View Post
    how did u get k<=13 and i got k <= -5
    We are looking for real solutions of:

    y^2-6y+(k-4)=0

    the discriminant of this is:

    d=(-6)^2-4(k-4)=52-4k,

    and this has to be >=0,m so:

    52-4k>=0

    which implies thet:

    52>=4k,

    13>=k,

    or k<=13.

    If you have something else tell us how you got what you have so we
    can see where we/you have gone down different paths.

    RonL

    RonL
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