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Math Help - Proof

  1. #1
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    Joined
    Dec 2007
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    80

    Proof

    n is a positive integer. show that n^2+n is always positive.

    How would i prove this? substitue numbers in?
    thnx
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  2. #2
    Super Member
    Joined
    Oct 2007
    From
    London / Cambridge
    Posts
    591
    factorise

    n(n+1)

    if n in an _nt_g_r then n+1 is also an _nt_g_r and the pr_d_c_ of two _nt_g_rs is also a ____________.
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