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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: High school
Topic ID: 272
Message ID: 2
#2, RE: Imaginary Numbers
Posted by Mohan on Nov-26-04 at 12:12 PM
In response to message #0
Remember that square root of "a square is the absolute value of a" ,ie a non negative real number .Also sqrt(ab ) = sqrt (a )*sqrt(b)only when both a and b are positive.sqrt(-1 * -1)=sqrt(-1)* sqrt(-1)is incorrect.
thanks