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23 July, 16:17

Find the coordinates of the vertex of the parabola y=x²-8x+2

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  1. 23 July, 17:59
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    There are a few ways to do it. Here's how I would get it. Take the derivative and set it to zero and solve for x. That gives the x coordinate of the vertex. Then plug that x value in the function to see which y value corresponds. The derivative is given by

    y'=2x-8

    So set it to zero and get x

    2x-8=0

    2x=8

    x=4

    Now put x=4 in your original function

    4^2-8 (4) + 2=-14

    So the vertex is at (4, - 14)
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