# hard core 1 surds question

Announcements
#1
10+ 7root5 + 38/1+2root5
0
6 years ago
#2
(Original post by ruby598)
10+ 7root5 + 38/1+2root5
I assume you want to simplify it... please state so in the question, also remove ambiguity by using brackets so it's 38/(1 + 2root5) not 38/1+2root5

In any case, you'll want to rationalise the by multiplying the top and bottom of the fraction by .
1
6 years ago
#3
(Original post by ruby598)
10+ 7root5 + 38/1+2root5
How should you approach it? What have you tried so far?
0
6 years ago
#4
Rationalise the denominator by multiplying by the conjugate. (You should have been taught this)
0
6 years ago
#5
(Original post by Zacken)
I assume you want to simplify it... please state so in the question, also remove ambiguity by using brackets so it's 38/(1 + 2root5) not 38/1+2root5

In any case, you'll want to rationalise the by multiplying the top and bottom of the fraction by .

As we think ubisoft is staying, before rationalising the denominator we suggest you treat this as a fraction and get both numerators under a common denominator.

You will end up with 80 + ??SQRT5 divided by 1 + 2SQRT5

Then rationalising this as ubisoft suggests should be fairly easy. Good luck!
0
#6
Thank you! Yes I did mean simplify thank you

Posted from TSR Mobile
0
6 years ago
#7
Normally surds can be simplified in the form a√b or a√b + c. This can be achieved by breaking down the bigger surds and/or rationalising the denominator of any fraction. This question involves the latter.

Hope this helps,

Tom (IDK-tuition.com: online maths, economics and ACT tuition/resources)
0
#8
Thank you!
0
X

new posts
Back
to top
Latest

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### Poll

Join the discussion

They're better than I expected (92)
41.44%
They're exactly what I expected (54)
24.32%
They're lower than I expected (76)
34.23%