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9 February, 05:34

Rational expressions

(for what value of x is the rational expression below undefined) ?

3x-12/9-x ... ?

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Answers (1)
  1. 9 February, 06:44
    0
    The answer

    3x-12/9-x is undefined if 9-x=0, it means x=9

    the value of x=9

    proof

    3*9 - 12/9-9 = 15/0 (undefined)
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