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20 February, 16:28

Whats the vertex form of y=x^2-20x+15

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  1. 20 February, 17:25
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    This looks like a parabola so:

    y=x^2 - 20x + 15 - - > x^2 - 20x + 15=y

    (x^2 - 20x) = y - 15 - - > (x - 10) ^2=y - 15 + 100 (used complete the square)

    (x - 10) ^2=y + 85
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