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# Edexcel Core 3 - 21st June 2016 AM watch

1. (Original post by Supermanxxxxxx)
Attachment 541923
3ai anyone explain how

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Change of base rule.
2. (Original post by Supermanxxxxxx)
Attachment 541923
3ai anyone explain how

Attachment 541925

Along with question 4 not sure on a and b

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For.first one e^y=x so y log 2 e = log 2 x i think
3. (Original post by NotNotBatman)
Change of base rule.

But surely Ln can't be used for a change of base rule

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4. (Original post by SeanFM)
Change of base of log formula for first one.

Factor formulae for 4a.
What exactly do you mean by factor formulae,

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5. (Original post by Supermanxxxxxx)

But surely Ln can't be used for a change of base rule

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is , so why not?
6. (Original post by Supermanxxxxxx)
What exactly do you mean by factor formulae,

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Check your formula booklet or C3 textbook
7. Is it worthwhile doing the old papers from like 2007-2009? They seem so easy compared to recent papers??

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8. (Original post by NotNotBatman)
is , so why not?
I did not know that, thank you

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9. In the june 14 R paper ... question 3(i)a) why does the denominator disappear after the first step once you've found the common denominator? Thanks in advance
10. (Original post by Don Joiner)
Is it worthwhile doing the old papers from like 2007-2009? They seem so easy compared to recent papers??

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They do seem a bit easier, but there are things in them that haven't come up in a while, like inverse trig equations, which may be useful.
11. (Original post by Clovers)
In the june 14 R paper ... question 3(i)a) why does the denominator disappear after the first step once you've found the common denominator? Thanks in advance
Common denominator on LHS & RHS multiplying through will give you 1/1 cancelling it out.
12. (Original post by Middriver)
Common denominator on LHS & RHS multiplying through will give you 1/1 cancelling it out.
Ahh okay

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13. (Original post by SeanFM)
Functions and are such that and f(x) = ln(2x+5)

a. State the range of g(x).

b. State the domain of f(x).

c. State the domain of f(g(x)) and calculate the range.

d. Find f(g(x)).

e. Find the inverse function of f(g(x)) and state its domain.

f. Find the derivative of f(g(x)) with respect to x.

undercxver
How comes you mentioned me?
14. (Original post by undercxver)
How comes you mentioned me?
Practice
15. (Original post by SeanFM)
Practice
I was trying to understand it but tbh I can't.
Spoiler:
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I haven't touched C3 in about two weeks, same goes for C4.

Will hit the C3 and C4 papers in two days.

Thanks a lot though.
16. I'm so depressed I did like no work today and did an M1 paper which I messed up. C3 is looming and I'm only at around 84-88UMS

My life = a mess

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17. (Original post by undercxver)
I was trying to understand it but tbh I can't.
Spoiler:
Show
I haven't touched C3 in about two weeks, same goes for C4.

Will hit the C3 and C4 papers in two days.
Thanks a lot though.
S'okay I just do that, get through life one exam at a time then focus revision purely on the next one.
18. (Original post by Don Joiner)
I'm so depressed I did like no work today and did an M1 paper which I messed up. C3 is looming and I'm only at around 84-88UMS

My life = a mess

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If you have a bad day, go to sleep and try again the next day that's what i do.
19. (Original post by SeanFM)
If you have a bad day, go to sleep and try again the next day that's what i do.
Thanks, I just can't shake the feeling of impending doom and that all my future goals will be messed up if I mess up

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20. (Original post by Don Joiner)
Thanks, I just can't shake the feeling of impending doom and that all my future goals will be messed up if I mess up

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I wouldn't blame you at this hour.. best to be getting enough sleep.

Yes, there is pressure, but it is not the end of the world if you don't do as well as you'd expected (there are places other than Cambridge that exist! ) but for now, the focus should be on doing as well as you can in the exam and that is all that you can do. Also keep learning from past papers and looking at what's stopping you from getting those final 10-15 UMS.

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