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27 December, 10:37

F (x) = - x^2+8x+9

What is the vertex and it the vertex the minimum or maximum?

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  1. 27 December, 12:26
    0
    X - Vertex

    -8 = - 8 = 4

    2 (-1) - 2

    Y - Vertex

    f (x) = - x² + 8x + 9

    f (4) = - (4) ² + 8 (-4) + 9

    f (4) = - (16) - 32 + 9

    f (4) = - 16 - 23

    f (4) = - 39

    (x, f (x)) = (x, y) = (4, - 39)
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