anonymous
  • anonymous
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!
Mathematics
chestercat
  • chestercat
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phi
  • phi
I think |0|= -0, so how about a≤0 ?
mathstudent55
  • mathstudent55
2. is correct.
anonymous
  • anonymous
okay, thanks! but my book said for #1 yes, |a| = -a if a < 0.

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mathstudent55
  • mathstudent55
For 1. I agree with @phi, not with your book.
anonymous
  • anonymous
okay, thank you both! :)
phi
  • phi
Interesting. Wolfram says otherwise http://www.wolframalpha.com/input/?i=for+real+x%2C++solve+%7Cx%7C+%3D+-x
mathstudent55
  • mathstudent55
wlcm

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