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1. Re: Higher Maths 2012
Can someone explain why it is root 7 and -3, rather than root 7 and positive 3 in 2008. Paper 2. Question 3.
2. Re: Higher Maths 2012
(Original post by JaggySnake95)
Can someone explain why it is root 7 and -3, rather than root 7 and positive 3 in 2008. Paper 2. Question 3.
Normally a sin graph goes from 0 up to 1 down to 0 down to -1 and back up to 0, those are y values. This graph goes down then up then up then down. If it were positive 3 it would follow the former pattern so it can't be. A negative in front of the sin will flip a sin graph across the x axis, ie make it go down the up...
Therefore we need -3
Last edited by benten17; 21-05-2012 at 00:31.
3. Re: Higher Maths 2012
(Original post by benten17)
Normally a sin graph goes from 0 up to 1 down to 0 down to -1 and back up to 0, those are y values. This graph goes down then up then up then down. If it were positive 3 it would follow the former pattern so it can't be. A negative in front of the sin will flip a sin graph across the x axis, ie make it go down the up...
Therefore we need -3
That's what I thought but surely the root 7 should be negative then?
4. Re: Higher Maths 2012
(Original post by JaggySnake95)
That's what I thought but surely the root 7 should be negative then?
I just negative repped you by mistake when I meant to hit quote on my stupid iPhone. Sorry! Dunno how to undo.

Also, the root7 graph is a cos graph which normally starts at 1 anyway?
Last edited by Bonzo10; 21-05-2012 at 01:09.
5. Re: Higher Maths 2012
Good luck Everyone. Hope it goes good!
6. Re: Higher Maths 2012
woke up bright eyed and bushy tailed, got a good feeling today this is going to be a nice paper! they can't put us through the torture from that credit exam from last year and a hard exam this year?! haha good luck everyone!
7. Good luck today everyone! Bit nervous but sure everyone will do fine!!

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8. Re: Higher Maths 2012
just as short revision, when then the roots are real, irrational if say , and rational if ? then, if then the roots are equal, and if then the roots are not real, unequal, ah good remembered !
9. Re: Higher Maths 2012
Up at 8 for a couple past papers and reminding myself of some of my notes.
10. Re: Higher Maths 2012
Best of luck today, all
11. Re: Higher Maths 2012
I tried to do a supposedly nice past paper to get me in a mathematical mindset I guess, then started crying because I couldn't do the first steps of an 8 marker.. awh that's a good omen!

Good luck today everybody, we've all worked hard enough!
12. Re: Higher Maths 2012
(Original post by Blue7195)
just as short revision, when then the roots are real, irrational if say , and rational if ? then, if then the roots are equal, and if then the roots are not real, unequal, ah good remembered !
Remember that when working out complicated roots you are square rooting b^2 - 4ac

In 2011 at least, the discriminant = 23, in other words b^2 - 4ac = 23 and since it's greater than 0 then there will be two real roots

When it equals 0 there is one equal root and if it's less then there will be no real roots

And if a surd still remains even after simplifying then yes it's irrational and if it can eventually be broken down into whole numbers then it is rational
Last edited by TheRedGoldfish; 21-05-2012 at 10:55.
13. Re: Higher Maths 2012
okay please cn someone help me?!
14. Re: Higher Maths 2012
with this? ahhhh
Attached Thumbnails

15. Re: Higher Maths 2012
You need to put the two equations equal to each other and solve to find x.
16. Re: Higher Maths 2012
(Original post by Blue7195)
with this? ahhhh
Start by setting the equations equal to each other and solve to find x.
17. Re: Higher Maths 2012
(Original post by auberjean)
Start by setting the equations equal to each other and solve to find x.
i end up getting .. how do i solve this? synthetic doesn't work.. neither does diff..
18. Re: Higher Maths 2012
(Original post by Blue7195)
i end up getting .. how do i solve this? synthetic doesn't work.. neither does diff..
Make x=1 and do synthetic division
19. Re: Higher Maths 2012
EDIT: The person above is right.
Last edited by Herzschmerz; 21-05-2012 at 11:18.
20. Re: Higher Maths 2012
(Original post by aroy45)
Make x=1 and do synthetic division
thanks so much! seen it and was like ahhh... incase it came up today so freaked out a lil' :P