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13 June, 01:49

Express f (x) in the form a (x-h) ^2+k for f (x) = x^2-8x+21

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  1. 13 June, 05:30
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    X^2-8x+21

    =x^2-2 (4) (x) + 16+5

    = (x-4) ^2+5

    here a=1

    h=4

    k=5
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