Question 3842
to do anything algebraically with square rooting a fraction, the numerator and denominator have to be good numbers...


{{{sqrt(16/25)}}} is either +4/5 or -4/5


{{{sqrt(9/20)}}} is +{{{3/sqrt(20)}}} or -{{{3/sqrt(20)}}}. You can leave this alone or you can "simplify" the square root...called a "surd" - make sure you spell this and more importantly, pronounce this, correctly.


{{{sqrt(20)}}} is the same thing as {{{sqrt(4*5)}}} which is the same thing as {{{sqrt(4)}}}{{{sqrt(5)}}}, which is +-2{{{sqrt(5)}}}.


Hope this helps


jon