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greeneyes<3

  • one year ago

Check please?? 1. Can it ever be true that |a| = -a for real number a? Explain. my answer: yes, if a < 0. 2. is it possible for a real number to be both rational and irrational? Explain. my answer: no, b/c rational #s can be written as a fraction and irrational #s cannot. Thank you!

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  1. phi
    • one year ago
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    I think |0|= -0, so how about a≤0 ?

  2. mathstudent55
    • one year ago
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    2. is correct.

  3. greeneyes<3
    • one year ago
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    okay, thanks! but my book said for #1 yes, |a| = -a if a < 0.

  4. mathstudent55
    • one year ago
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    For 1. I agree with @phi, not with your book.

  5. greeneyes<3
    • one year ago
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    okay, thank you both! :)

  6. phi
    • one year ago
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    Interesting. Wolfram says otherwise http://www.wolframalpha.com/input/?i=for+real+x%2C++solve+%7Cx%7C+%3D+-x

  7. mathstudent55
    • one year ago
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    wlcm

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