Posted by **dee** on Sunday, July 29, 2007 at 11:53am.

can someone help me with simplification: 20/5 - 1/5

my first answer is 1/5

my second answer is 10 -5/5

but the answere I have to choose from are:

(a) 20 - 55/5

(b) 20 - 5/5

(c) cannot be simplified

(d) 1/55

which is correct and if I'm not where did I go wrong?

√20/5 - 1/√5

= 2√5/5 - 1/√5*(√5/√5)

= 2√5/5 - √5/5

= √5/5

by the way:

1/√5 = √5/5 so your answer would be correct.

However, it is considered "better form" to have radicals in the denominator rationalized

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