Author: Mark Ritchings

On quadratic sequences

This is a guest post from Mark Ritchings, a maths tutor in Bury. A quadratic sequence is a sequence for which the $n$th term is $an^2+bn+c$. The constants $b$ and/or $c$ might be zero but $a$ definitely isn't. The first term is $a\times 1^2 +b \times 1 + c =

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