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January 9th, 2011, 03:01 AM  #1 
Newbie Joined: Jan 2011 Posts: 11 Thanks: 0  exam tomorrow, few problems with surds,sequences,factorising
Big day tomorrow! I have found some past paper questions, but there is no mark scheme and I don't get some of them! Firstly: 32timesroot 2=2 to power of a, find a 
January 9th, 2011, 03:03 AM  #2 
Newbie Joined: Jan 2011 Posts: 11 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori
If some of you could please have a clear concise method of doing these it would be really appreciated, and not just answers!

January 9th, 2011, 03:18 AM  #3 
Newbie Joined: Jan 2011 Posts: 11 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori
I'm thinking 32 to power of 1 times 2 to power of 1/2 =2 to power of a 1 1/2 =a? 
January 9th, 2011, 03:33 AM  #4 
Senior Member Joined: Feb 2010 Posts: 135 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori 32 = = a = 5.5 
January 9th, 2011, 05:50 AM  #5 
Senior Member Joined: Oct 2010 From: Vietnam Posts: 226 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori
32.squareroot2=2^a 2^5.2^(0.5)=2^a 2^(5.5)=2^a So a=5.5 
January 9th, 2011, 07:58 AM  #6 
Newbie Joined: Jan 2011 Posts: 11 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori
Ok I understand now as 5+ 1/2 =5.5. The next problem I have is this sequences problem as shown in the picture... I factorized it given that a=7 and d=6, and ended up with 172 and that doesn't work... 
January 9th, 2011, 08:12 AM  #7 
Newbie Joined: Jan 2011 Posts: 22 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori
Have a look here, it might help http://en.wikipedia.org/wiki/Arithmetic_progression 
January 9th, 2011, 08:22 AM  #8 
Math Team Joined: Apr 2010 Posts: 2,780 Thanks: 361  Re: exam tomorrow, few problems with surds,sequences,factori
Hello Gladiatorx, Chimoo's information is useful. Maybe it helps you understand: Can you find n such that ? Which solution for “n” do you choose and why? Hoempa 
January 9th, 2011, 08:34 AM  #9 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,943 Thanks: 1134 Math Focus: Elementary mathematics and beyond  Re: exam tomorrow, few problems with surds,sequences,factori
The sum of an arithmetic series is given by where is the first term and is the common difference. Substituting known values: Solve and choose the appropriate root. 
January 9th, 2011, 10:17 AM  #10 
Newbie Joined: Jan 2011 Posts: 11 Thanks: 0  Re: exam tomorrow, few problems with surds,sequences,factori
i got to there and got 172, but using n=172 gives a massive answer so....


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