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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factorise $\displaystyle n(n+1)$ 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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