algebra 2

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y = 4x2 - 12x + 9

  • what is the question ? -

    You want zeros of y or what?
    if zeros:
    4 x^2 - 12 x + 9 = 0
    (2 x-3)(2x-3) = 0
    x = 1.5, 1.5 double root

    If vertex etc:
    4 x^2 -12 x = y - 9

    x^2 - 3 y = (1/4)(y-9)
    x^2 - 3 y + 9/4 = (1/4)y
    (x-1.5)^2 = y/4
    vertex at (1.5 , 0) which we knew already

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