calculus

lim x->16 4- sqrt(x) / x-16

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  1. Did you realize that
    x-16 = (√x+4)(√x-4) ?

    then your limit question simplifies to

    lim (4-√x)/( (√x+4)(√x-4) ) as x --> 16
    = lim -1/(√x+4) as x --> 16
    = -1/8

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