Mathematics for IGCSE & O level - Sequences (Section 2 - No. 20)

The nth term of a sequence is given by \(T_n = 2n^2 + 5\). What is T2?

9

13

18

23

Vysvětlení

Substitute n=2 in the formula, T2= 2*(2)^2 + 5 = 13

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