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8 July, 08:16

Which equation represents y = x2 - 10x + 30 in vertex form?

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  1. 8 July, 11:24
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    To complete the square, you can add (and subtract) the square of half the x coefficient.

    ... y = x² - 10x + 30

    ... y = (x² - 10x + 25) + (30 - 25)

    ... y = (x - 5) ² + 5
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