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19 September, 11:16

The nth term of a quadratic sequence is:

n²+2n-4

Work out the first three terms of this sequence.

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  1. 19 September, 14:39
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    We can work out the first three terms of this quadratic equation with substitution.

    The first term of this sequence is where n=1, we can substitute 1 in for n

    y=1^2+2 (1) - 4

    y=1+2-4

    y=-1

    We can do this for the next two terms as well

    y=2^2+2 (2) - 4

    y=4+4-4

    y=4

    For the last term:

    y=3^2+2 (3) - 4

    y=9+6-4

    y=11
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