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anonymous

  • 5 years ago

find any real number for which the rational expression is undefined a-5/7

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  1. anonymous
    • 5 years ago
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    is it (a-5)/7 or a-(5/7)???

  2. anonymous
    • 5 years ago
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    (a-5)/7

  3. anonymous
    • 5 years ago
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    it's defined for all values of a.. if you were asking about \[7 \over a-5\] then it would be undefined at \[a-5=0 \implies a=5\]

  4. anonymous
    • 5 years ago
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    so then answer would be 0 or 5?

  5. anonymous
    • 5 years ago
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    the answer to your question would be "phi" (since there is no a where (a-5)/7 the expression undefined)

  6. anonymous
    • 5 years ago
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    I meant by phi the empty set.. looks I am complicating things!! :) you just need to know that the expression you gave is defined for all values of a. that's it

  7. anonymous
    • 5 years ago
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    ok thanks

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