View Full Version : Maths question +REP
Apolva
05-06-2010, 01:51 PM
Hey I'm stuck on this from a past paper:
Expand and simplify: (√3+√15)²
Give your answer in the form n+m√5, where n and m are integers.
Thanks
Boonzeet
06-06-2010, 12:05 PM
Geez, what exam board are you sitting? That's a bloody difficult question. Sorry I can't be of help!
Kieran
06-06-2010, 12:10 PM
It's a long time since I've done any maths like this so forgive me if I'm wrong
(√3+√15)² = (√3+√15)(√3+√15)
Then you need to expand the brackets out. Doing so you get this:
√9 + √45 + √45 + √225
This then goes to
3 + 3√5 + 3√5 + 15
Which equals (18 + 6√5)
Apolva
06-06-2010, 01:22 PM
Thanks a lot
+rep :)
Kieran
06-06-2010, 01:31 PM
No problem :)
I remember doing those sort of questions.... memories xD
alexxxxx
06-06-2010, 01:49 PM
it's all about binomial expansions these days gawsh.
MattFr
06-06-2010, 02:01 PM
it's all about binomial expansions these days gawsh.
binomial expansions are ez, lern some moar math
alexxxxx
06-06-2010, 02:39 PM
binomial expansions are ez, lern some moar math
did i say dey were ard m8?
MattFr
06-06-2010, 03:06 PM
did i say dey were ard m8?
no m8, i didnt say you did
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