mattr4960 mattr4960
  • 13-11-2018
  • Mathematics
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Why do you disregard the negative square root in the pythagorean theorem?

25 POINTS!!!!   PLEASE HELP!!!!!!!!!!!



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tonb
tonb tonb
  • 13-11-2018

The pythagorean theorem is

[tex]r^2 = a^2 + b^2 \implies r = \pm \sqrt{a^2+b^2}[/tex]

However, r is defined to be a distance, which has no meaning when it is negative.

[edit] Since negative distance has no meaning, the negative square root in above equation is never used.


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