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Confusing simplification

  • Thread starter ProPatto16
  • Start date
  • #1
326
0
in an example ive got in a textbook it shows this

<2t,2t2,1>
sqrt(4t2+4t4+1)

becomes

<2t,2t2,1>
2t2+1


how?
 

Answers and Replies

  • #2
2,544
2
they factored the bottom part and then took the square root .
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,833
955
[tex]\sqrt{a^2}= |a|[/tex]
and [itex]2t^2+ 1[/itex] is never negative.
 

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