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16 March, 20:21

If f (x) = x*-81 and g (x) = (x-9) - 1 (x+9), find g (x) * f (x).

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  1. 16 March, 22:46
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    F (x) = x²-81

    g (x) = (x-9) - 1 (x+9)

    = (x-9) - x-9

    g (x) • f (x)

    = [x²-81 ] • [ (x-9) - x-9 ]

    =[ x²-81 ] • [ (x-x - 9-9) ]

    = [ x²-81 ] •[0-18]

    = [ x²-81] •[ - 18]

    = - 18•x² + - 81•-18

    = - 18x²+1458
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