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# 2016 Edexcel C2 Morning exam[discussion thread]

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1. (Original post by TheBillPN)
Spell it out for me clearer.

2^(2x+5) -7(2^x)=0

Let 2^x=y

so 7(2^x)=7y

how do you do the 2^(2x+5)
2^(2x+5) laws of indices allow you to rewrite this as (2^5)(2^2x). Then as 2^2x= (2^x)^2 so this bit equals y^2. So you get 2^5 lots of y^2 which is 32y^2.
2. Geometric:b) 256c) 1.201Binomial:A = 16k = 7/2B = 936Integration = 24.3Trapezium:a) 7b) 20.75c) R = 5.75Factor theorem:a) 5c) (x + 2)(3x + 2)(2x - 1)Differentiation(Q10):a) 2/3PIx^2d) Minimum = 120mc) x = 16.63... => f''(x) = 0.437 > 0 Trig identities:a) Theta = 8/15Pi , -2/15Pi b) x = 194.5, 345.5Circle:a) root(34)c) 3x + 5x - 95 = 0Log:i) (a - 5)/9ii) -2.19
3. (Original post by Leeteuk)
it was absolutely nightmare
*an absolute nightmare
4. (Original post by Hangk13)
What did everyone get when substituting their x value into the 2nd differential to show it was a minimum point? (very last question part e)

I got a really small decimal??
i also got a decimal after defferentiating again , but as long as it was greater than 0 (which it was) this proves the value is a minimum
5. can someone put up a link to arseys solution
6. Any mark scheme up?
7. (Original post by marshmellow:))
2^(2x+5) laws of indices allow you to rewrite this as (2^5)(2^2x). Then as 2^2x= (2^x)^2 so this bit equals y^2. So you get 2^5 lots of y which is 32y^2.
awesome thanks,

so you get 32y^2 -7y=0, and then solve like a regular old equation.

y(32y-7)=0

y=0
y=7/32
so then 2^x=0
and also 2^x=7/32

log(base2) (0) cant be done
so log(base2)(7/32)=x
8. (Original post by Shqipron)
When does BTEC maths start?
haha you're dumb
Any mark scheme up?
http://www.thestudentroom.co.uk/show...3#post65151283 Mine
10. (Original post by TheBillPN)
awesome thanks,

so you get 32y^2 -7y=0, and then solve like a regular old equation.

y(32y-7)=0

y=0
y=7/32
so then 2^x=0
and also 2^x=7/32

log(base2) (0) cant be done
so log(base2)(7/32)=x
yes that's what I did
11. Awesome, i've been looking through the mark schemes people are talking about and i'm pretty sure ive got everything else right, so 71/74 for me!
12. (Original post by TheBillPN)
Awesome, i've been looking through the mark schemes people are talking about and i'm pretty sure ive got everything else right, so 71/74 for me!
13. (Original post by marshmellow:))
can someone put up a link to arseys solution
He isn't putting solutions up, here is the link for his reasons
http://www.thestudentroom.co.uk/show...rimary_content
14. [QUOTE=Lairyfliquid;65149165]that was rough. Couldn't do any of 9 and parts of 6- does anyone know if a mark scheme is coming up soon?
question 6 a. was not easy it was by far the hardest question on the paper but to be expected as most of the other questions were fairly simple the last question could definitely make those who lack knowledge of the properties of geometric shapes slip up as it requires prior knowledge of area formulas and the fact that all 3 angles of an equilateral triangle are 60 whoever managed to do the last question clearly has solid understanding of certain topics and was able to interpret the question fully.
15. (Original post by mcfatty)
how did we find it all?

like the differentiation question?

It was absolutely horrible. Didn't get that question at all. I ended up getting a negative number for the minimum!!! What do u need for a C ??
16. (Original post by hi x)
haha you're dumb
No he's not. He's a legend.
#banter
#friendsforlife
17. aww there's not gonna be an arsey mark scheme

http://www.thestudentroom.co.uk/show...ighlight=arsey
18. does anyone remember what question "1c)" was asking?
19. Listen Jumana, it was the easiest C2 paper in recent years so do not insult Edexcel in this inappropriate manner. Your revision was a disaster darling.
20. (Original post by X_IDE_sidf)

1 b) (2 marks)
c) (2 marks)

2 a) (1 mark)
b) (3 marks)
c) (2 marks)

3 a) (2 marks)
c) (4 marks)

4 a) (2 marks)
b) (2 marks)
c) (4 marks)

5 a) (4 marks)
b) (1 mark)
c) (2 marks)

d) (2 marks)

6 i) (3 marks) or

ii) (6 marks) or

7 b) (3 marks)

8 ii) (4 marks)

9 a) (2 marks)
d) (5 marks)
c) (2 marks)

my unofficial mark scheme
Note that question 6) ii) , had 3 values, original value for x was -14.4 but you also get 14.4. You may want to check that.

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