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# C1 Maths extra practise watch

1. cant solve it atm but multiply the whole thing by the denominator with a flipped sign so - to + then simplify it? is that correct?
2. (Original post by not_lucas1)
cant solve it atm but multiply the whole thing by the denominator with a flipped sign so - to + then simplify it? is that correct?
Not quite. This is an example where you need to rationalise twice.

BTW: Did you see my earlier link?
3. (Original post by SeanFM)
Here is a question for you to try

A sequence of numbers is given by .

Given that , find and .

Hence find the value of .

Hence, or otherwise, find the value of .
Jeeeeeeeesus, you have to do that in core1 in your exam board?! That's core2 for me
I'm so glad to have MEI
4. (Original post by C-rated)
Jeeeeeeeesus, you have to do that in core1 in your exam board?! That's core2 for me
I'm so glad to have MEI
I do not think anything like that would be asked in an exam, it's just an extension question to test people on arithmetic series, recurrence relations and sum notation

I think MEI is more of a pain from what I've heard not in AS but with a comprehension paper in A2 + coursework or something like that.
5. (Original post by SeanFM)
I do not think anything like that would be asked in an exam, it's just an extension question to test people on arithmetic series, recurrence relations and sum notation

I think MEI is more of a pain from what I've heard not in AS but with a comprehension paper in A2 + coursework or something like that.
The coursework is total bs, but the comprehension paper is alright. Both are only worth 6.6666% of the total grade put together though
6. (Original post by Zacken)
On the mean side, but whatever - show that:

where are integers to be determined.
Er are these the correct answers:
I probably messed up somewhere :/
Spoiler:
Show
a = 1, b = 2 , c = 1.
7. (Original post by Someboady)
Er are these the correct answers:
I probably messed up somewhere :/
Spoiler:
Show
a = 1, b = 2 , c = 1.
Not quite, but very close.
8. (Original post by C-rated)
The coursework is total bs, but the comprehension paper is alright. Both are only worth 6.6666% of the total grade put together though
Eeek, I see. I don't know how difficult they are (it looks pretty difficult ). But I guess that's some good news for people trying to get an A*.
9. Oops - my question is slightly incorrect, hang on a second

Rationalise

Hence, or otherwise, find the equation of the tangent at the point (22,10) on the line given by the equation

(Original post by not_lucas1)
cant solve it atm but multiply the whole thing by the denominator with a flipped sign so - to + then simplify it? is that correct?

(Original post by Someboady)
Er are these the correct answers:
I probably messed up somewhere :/
Spoiler:
Show
a = 1, b = 2 , c = 1.

(Original post by imran_)
Hi, im resitting C1 this year and aiming for at least 95%
ive finished ALL past papers from edexcel and ALL solomon papers
coming close to the exam does anyone have any good resources to revise c1 from?
ive tried MADASMATHS papers and some of the questions being asked are ridiculously weird
Try that if you want, but no pressure - it looks scarier than it is, especially the equation
10. a=1
b=1
c=1

This was a nasty question and I'm not too sure about the answer but this is what I got 😩
11. (Original post by odera_dim)
a=1
b=1
c=1

This was a nasty question and I'm not too sure about the answer but this is what I got 😩
Same, I got that too
12. ^ I also got a,b,c all equal to 1
13. (Original post by odera_dim)
a=1
b=1
c=1

This was a nasty question and I'm not too sure about the answer but this is what I got 😩
how did you do it?
14. it becomes 16+8(root2 +root3 +root6)/8 which equals 2 + root2 +root3 +root6
15. (Original post by SeanFM)
Here is a question for you to try

A sequence of numbers is given by .

Given that , find and .

Hence find the value of .

Hence, or otherwise, find the value of .
isnt this c2?
16. (Original post by imran_)
how did you do it?
As Zacken said you have to rationalise it twice First by root3 +root6 +1 and then by 2root3+2
17. (Original post by imran_)
how did you do it?
rationalise the denominator first by flipping the signs, you should come out with the denominator still being in surd form so rationalise again and simplify

I'm terrible at explaining btw 😭
18. (Original post by imran_)
how did you do it?
Rationalize the denominator the way you normally would, collect all like terms, then do it again, and simplify to be in terms of root 6, root 3 and root 2.
19. could someone provide a step by step with answers? ive tried how you said but must have completely messed up
20. (Original post by not_lucas1)
could someone provide a step by step with answers? ive tried how you said but must have completely messed up
When you rationalised the first time what did you get for the denominator?

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