Math (URGENT)

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How to graph:

y=x(x-4)


Calculator shows the vertex at (2,-4)
Can someone explain why? Thanks.

  • Math (URGENT) -

    Try completing the square.

    x(x-4) = x^2 -4x +4 -4
    = (x-2)^2 - 4

    The vertex is the lowest point of the parabolic curve. That is obviously where x = 2, where the first term is zero.

    The value of y there is -4.

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