ITT

use the eight step strategy to graph
f(x)=-3x2-12x-5
find the vertex
find x and y intercepts
determine the number of points to graph
graph the parabola

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asked by shan
  1. f(x) = -3(x^2+4x) - 5
    = -3(x^2+4x+4) - 5 +3(4)
    = -3(x+2)^2 + 7

    so, the vertex is at (-2,7)
    clearly, (0,-5) is the y-intercept
    solve for x to get the two x-intercepts

    see

    http://www.wolframalpha.com/input/?i=-3x^2-12x-5

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    posted by Steve

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