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college math

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find the vertex and graph of y=.3x2+1.8x-2

  • college math - ,

    y = 0.3 x^2 + 1.8 x - 2 ???

    .3 x^2 + 1.8 x = y+2

    x^2 + 6 x = (10/3)y + 20/3

    x^2 + 6 x + 9 = (10/3) [y + 2/3 + 2.7/3]

    (x+3)^2 = (10/3) [ y + 4.7 ]

    (-3, -4.7) vertex
    axis of symmetry is x = -3
    upright, holds water

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