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1. For 83 I keep getting a repeated root where X=-2 but the answer should be C not A. Please explain ...
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2. (Original post by Jas1947)
For 83 I keep getting a repeated root where X=-2 but the answer should be C not A. Please explain ...
Well firstly; x=-2 is not a root. Secondly, in the case where you WOULD get a repeated root, that would account for 2 answers unless the question specifies "how many distinct real roots are there?" in which case the repeated root would account for 1, I believe.
3. (Original post by Jas1947)
For 83 I keep getting a repeated root where X=-2 but the answer should be C not A. Please explain ...
There is no repeated root.
4. x= 0 is a solution aswell
5. That's the question from the Cambridge specimens pre-interview paper isn't it? I wasn't sure if there's a better method but I differentiated and found the values that correspond to turning points. Found the co-ordinates of the turning points and just considered how the graph would look like. You'll find it'll cross the x-axis twice.
6. (Original post by alhrona)
x= 0 is a solution aswell
No it isn't.
7. (Original post by alhrona)
x= 0 is a solution aswell
Um...no. If then which doesn't make sense.
8. (Original post by B_9710)
No it isn't.
if you factorise it you get 2 solutions of x=0 from a xsquared
9. (Original post by NeverLucky)
Um...no. If then which doesn't make sense.
oh yeah , excuse me , it's been over a month since the exams so i have forgotten everything
10. (Original post by alhrona)
if you factorise it you get 2 solutions of x=0 from a xsquared
wot????
11. (Original post by alhrona)
if you factorise it you get 2 solutions of x=0 from a xsquared
There's a stationary point at x=0, not a root.
12. (Original post by alhrona)
if you factorise it you get 2 solutions of x=0 from a xsquared
You might want to read the "don't answer if you don't know what you're talking about at all" bit of the posting guide stickied at the top of the forum.
13. Alevel maths threads get me like
14. I have no idea if this is correct or not, but...

EDIT : sorry just realised the last part is a little wrong , b squared - 4ac = -2 squared - 4(1)(-root10) so should be 4 + 4root10 so still 2 real roots but not 16 + 4root10
15. (Original post by Zacken)
You might want to read the "don't answer if you don't know what you're talking about at all" bit of the posting guide stickied at the top of the forum.
Well, it's fabulous to see that Zacken's attitude is just as bad - if not worse - as when I used to pester him months ago.

The Cambridge snobbery is really coming on well, I see.
16. (Original post by Uni12345678)
I have no idea if this is correct or not, but...

Lovely - all correct.
17. (Original post by Bath~Student)
Well, it's fabulous to see that Zacken's attitude is just as bad - if not worse - as when I used to pester him months ago.

The Cambridge snobbery is really coming on well, I see.
I've really missed you
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18. (Original post by Student403)
I've really missed you
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2 minutes in and the TSRian grammar has already given me cancer. Oh, dear, why did I choose to come back?
19. (Original post by Bath~Student)
Lovely - all correct.
Thank you I had no idea if it was the right way of doing it I thought I was being an idiot loll x
20. (Original post by Bath~Student)
2 minutes in and the TSRian grammar has already given me cancer.
Finally some good news today

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