Homework Help: amth/algebra

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

can someone help me with simplification: Бу20/5 - 1/Бу5
my first answer is 1/Бу5
my second answer is 10 -Бу5/5
but the answere I have to choose from are:
(a) Бу20 - 5Бу5/Бу5
(b) Бу20 - Бу5/5
(c) cannot be simplified
(d) 1/5Бу5
which is correct and if I'm not where did I go wrong?

Б√20/5 - 1/Б√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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