Last updated on Oct 23, 2026

Quadratic Sequences (Junior Cert Mathematics): Flashcards

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Quadratic Sequences

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Quadratic sequence definition

Constant second differences

First differences in quadratic sequences

Not constant

Second differences in quadratic sequences

Constant

General term formula for quadratic sequence

$T_n = an^2 + bn + c$

$T_n$ in quadratic formula

Term at position $n$

$n$ in $T_n = an^2 + bn + c$

Position in sequence

$2a$ equals

Second difference

How to find $a$

Half the second difference

Equations needed for $b$ and $c$

Two

Terms used to create equations for $b$ , $c$

First two terms

Verifying quadratic formula

Substitute back to check terms match

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