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Y=-4x^2-8x-13 find the vertex of this parabola

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  1. 6 March, 01:29
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    Hello:

    Y=-4x²-8x-13

    = - 4 (x²+2x) - 13

    = - 4 ((x² + 2x+1) - 1) - 13

    = - 4 (x+1) ² + 4 - 13

    Y = - 4 (x+1) ² - 9

    the vertex is : (-1, - 9)
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