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# OCR Core 2 Maths: Wednesday 25th May 2016 Watch

1. what did everyone get for the period question too?
2. Did anyone get 38 for the summations sequences question and X=12,-3 for logs
3. i think it's only x=12, -3 wasn't possible
4. (Original post by M12345689)
Did anyone get 38 for the summations sequences question and X=12,-3 for logs
For some reason i got 37 for the summation i might have made a slip up some where. I got the same for the logs
5. (Original post by Stanspam)
i think it's only x=12, -3 wasn't possible
I thought because the X was squared it would make it possible as it would go to 9
6. (Original post by Stanspam)
i think it's only x=12, -3 wasn't possible
-3 was possible if you put it into the equation the bit inside the log was >0 as there was x^2 and x+4
7. Does anyone remember what the actual log question was?
8. (Original post by Csd1999)
Does anyone remember what the actual log question was?
2log x - log (x+4) = 3, I think

Edit: scratch that, guy below me is right
9. (Original post by Csd1999)
Does anyone remember what the actual log question was?
2log base 3 (X) - log base 3 (X+4) = 2
I think
10. (Original post by sandpitturtle)
what did everyone get for the period question too?
I got pi/a, just by trying sin x, sin 2x, sin 3x, etc and roughly sketching the graph.

(Original post by M12345689)
Did anyone get 38 for the summations sequences question and X=12,-3 for logs
Yep, I got that.

(Original post by Stanspam)
i think it's only x=12, -3 wasn't possible
-3 is possible because you square the x on top and add 4 to x on the bottom, so you get x^2 / 1
11. (Original post by h3rmit)
I got pi/a, just by trying sin x, sin 2x, sin 3x, etc and roughly sketching the graph.

Yep, I got that.

-3 is possible because you square the x on top and add 4 to x on the bottom, so you get x^2 / 1
-3 wasn't possible in the original equation
12. (Original post by Annonomous09)
-3 wasn't possible in the original equation
It is if
(Original post by M12345689)
2log base 3 (X) - log base 3 (X+4) = 2
is the original equation, which does definitely seem to ring a bell. If you apply the 2 as a power before logging it works and gives 2
13. Unofficial mark scheme anyone?
14. Does anyone know how many marks the log question was worth?
15. (Original post by h3rmit)
It is if

is the original equation, which does definitely seem to ring a bell. If you apply the 2 as a power before logging it works and gives 2
I don't think it counts as you can't really square a minus, and log isn't valid for negative numbers, but I am not tottaly sure
16. Was the period not 2pi/a?
17. (Original post by sandpitturtle)
I don't think it counts as you can't really square a minus, and log isn't valid for negative numbers, but I am not tottaly sure
Why cant you square a minus? Surely it works like squaring in general, turns it positive? Maybe they wanted you to state it would have to be 3 instead of -3?
18. (Original post by Sourestdeeds)
Why cant you square a minus? Surely it works like squaring in general, turns it positive? Maybe they wanted you to state it would have to be 3 instead of -3?
true, sorry i got confused with sqr rooting, i am still so unsure about that question if -3 was counted though
either way would probably only be a mark so not too fussed haha
19. (Original post by sandpitturtle)
true, sorry i got confused with sqr rooting, i am still so unsure about that question if -3 was counted though
either way would probably only be a mark so not too fussed haha
I was also confused because it works in the rearranged equation, just not the original. I just stuck with 12 anyway
20. What do people think the boundaries will be?

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