3 ms·
How do you trivially construct `n^2-1 = (n+1).(n-1)` ? I feel like I'm failing at basic algebra here, but I don't see it.
by tinco 13y ago
How do you trivially construct `n^2-1 = (n+1).(n-1)` ? I feel like I'm failing at basic algebra here, but I don't see it.
- pluies 13y ago(n+1).(n-1) = n^2 - n + n - 1 = n^2 - 1