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5 February, 14:15

The nth term of a sequence is an^2+bn write down an expression in terms of a and b for the 3rd term

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  1. 5 February, 14:56
    0
    9a + 3b

    Step-by-step explanation:

    just need to substitute n = 3 so we get

    a•3² + b•3 = 9a + 3b
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