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28 January, 07:00

For the quadratic equation, state the axis of symmetry, vertex, and any intercepts.

y = x2 - 4x - 5

+1
Answers (1)
  1. 28 January, 07:26
    0
    Axis of Symmetry is x = 2

    Vertex is (2, - 9)

    X Intercepts are (5, 0) and (-1, 0)

    Step-by-step explanation:

    Quadratic Equation is in standard form. Formula find the x value of the vertex in standard form is - b/2a

    a=1

    b=-4

    c=-5

    --4/2 (1) = 2

    Plugin to find the y value of the vertex.

    2^2-4 (2) - 5=y

    4-8-5=y

    y = - 9

    The x value of the vertex (in this case is 2) is the axis of symmetry. Therefore the axis of symmetry is x=2

    Factor the equation to put into intercept form.

    (x-5) (x+1) = y

    The equation can be FOIL-ed to get back to standard form.

    Separate the 2 parentheses and whatever can cancel the parentheses are your intercepts.

    For (x-5) your intercept is (5, 0)

    For (x+1) your intercept is (-1, 0)

    The x intercepts are where the parabola will cross the x axis on the graph.
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