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8 July, 06:24

Y = - 3x2 - 12

Axis of symmetry:

+3
Answers (2)
  1. 8 July, 07:51
    0
    Answer: x = 0

    Work Shown:

    y = - 3x^2 - 12 is the same as y = - 3x^2 + 0x + (-12)

    Compare this to y = ax^2 + bx + c, and we'll find that

    a = - 3

    b = 0

    c = - 12

    Plug the 'a' and 'b' values into the formula below and simplify

    h = - b / (2a)

    h = - 0 / (2 * (-3))

    h = 0

    The x coordinate of the vertex is x = 0, so the axis of symmetry is also x = 0.

    The axis of symmetry lays perfectly on top of the y axis.
  2. 8 July, 08:40
    0
    The answer to that would be - 18
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