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3 July, 05:56

Identify the domain and range of the function f (x) = 2x2 - 6x - 9.

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  1. 3 July, 06:16
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    Range is the y values or ouputs

    domain is inputs or x vvalues

    we can use any x value

    but at a certain y value, w can't go below that

    find thatminimum

    find the vertex

    for

    ax^2+bx+c

    the x value of the vertex is

    -b/2a

    plug that in to the equaiton to get the y value

    -b/2a = - (-6) / (2*2) = 6/4=3/2

    plug that in

    2 (3/2) ^2-6 (3/2) - 9

    2 (9/4) - 9-9

    9/2-18

    4.5-18

    -13.5

    domain=all real numbers

    range=from - 13.5 to positive infinity
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