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21 June, 17:20

For what value of x is the rational expression below undefined? x+8/x^2 - 2x-24

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  1. 21 June, 17:39
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    First step: Factor the expression.

    (x + 8) / (x - 6) (x + 4)

    Set each factor of the denominator equal to zero.

    x - 6 = 0 x + 4 = 0

    add 6 to both sides subtract 4 from both sides

    x = 6 x = - 4

    The function would be undefined if x = 6 or x = - 4
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