Which equation in standard form has a graph the passes through (1,-2) and has a of 2?

Which equation in standard form has a graph the passes through (1,-2) and has a of 2?


[tex]Which equation in standard form has a graph the passes through (1,-2) and has a of 2?[/tex]

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  1. 1) The equation is given in factored form

    2) The key characteristics of the parabola are;

    a. The parabola has 2 real roots and extends to infinity on both sides

    b. The x-intercepts of the parabola are (1/2, 0) and (-6, 0)

    c. The y intercept is (0, -6)

    d. The vertex point is (-2.75, -21.125)

    Step-by-step explanation:

    The given equation is f(x) = (2·x -1)(x + 6)

    Therefore the equation is given in factored form

    The key characteristic of the parabola revealed from the form f(x) = (2·x -1)(x + 6) are;

    1) Writing the parabola in the intercept form, a(x - p)(x -q) we have;

    f(x) = (2·x -1)(x + 6) = 2·(x - 1/2)(x + 6)

    p = 1/2, q = -6

    Therefore;

    Given that a is positive the parabola is concave upwards

    2) a. The parabola has 2 real roots and extends to infinity on both sides

    b. The x-intercepts of the parabola are p and q which are (1/2, 0) and (-6, 0)

    c. The y intercept is a·(-p)·(-q) = 2×(-1/2)×6 = -6

    The y intercept is (0, -6)

    d. Expanding we get;

    f(x) = 2·x² + 11·x - 6

    From the

    The vertex is h = -b/(2·a) = -11/(2×2) = -2.75

    h(2.75) = 2×(-2.75)² + 11×(-2.75) - 6 = -21.125

    Therefore, the function is symmetrical about the vertex point (-2.75, -21.125)

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