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21 January, 01:15

Write an exponential function y=an^x for a graph that includes (-4,72) and (-2,18)

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  1. 21 January, 01:32
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    18/72 = (ar^-2) / (ar^-4)

    1/4=r^2

    r = (1/4) ^ (1/2)

    r=1/2

    18=a (1/2) ^-2

    18=4a

    9/2=a

    y = (9/2) (1/2) ^x
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