1. ## Proof

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

How would i prove this? substitue numbers in?
thnx

2. 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 ____________.