# amth/algebra

posted by .

can someone help me with simplification: ã20/5 - 1/ã5
my second answer is 10 -ã5/5
but the answere I have to choose from are:
(a) ã20 - 5ã5/ã5
(b) ã20 - ã5/5
(c) cannot be simplified
(d) 1/5ã5
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:

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

## Similar Questions

1. ### math/algebra

simplify. ã20/5 - 1/ã5 I come up with 2 different answers (1) 2 ã5/5 - 1/ã5 2ã5 - 1ã5 1/ã5 or (2) ã20/5 - 1/ã5 = ã(4 ) - 1/ã5 2 - 1/ã5 = 10/5 - ã5/5 = (10- ã5)/5 and neither are the answers …
2. ### algebra

1)Find the 20th term of the arithmetic sequence in which a1=3 and d=7 a.143 b.136 c.140 d.133 an=a1+(n-1)d a20=3+(20-1)7 a20=3+(19)7 a20=3+133 answer=b 2)Write an equation for the nth term of the arithmetic sequence -3,3,9,15... a.an=n+6 …
3. ### algebra

I am having a hard time solving my problem 2ã20 + 5 ã 80 - 7 ã5 Can someone please help me
4. ### algebra

I am having a hard time solving my problem 2ã20 + 5 ã 80 - 7 ã5 Can someone please help me

4. 3ã11 + 4ã11 Answer: 8ã11 7. 7ã2 - 2ã8 Answer: 1ã2 ?
6. ### algebra

how do I rewrite this 4ã20
7. ### Math

Question 1 Write the first four terms of the sequence whose general term is given. an = 3n - 1 Answer 2, 3, 4, 5 2, 5, 8, 11 -2, -5, -8, -11 4, 7, 10, 13 3 points Question 2 Write the first four terms of the sequence whose general …