You are Here: Home

# logs - c2

Announcements Posted on
Talking about ISA/EMPA specifics is against our guidelines - read more here 28-04-2016
Uni student? Want a Samsung Galaxy S7? You could win one by taking our quickfire survey 15-04-2016
1. hi can someone tell me please the formula if you need to make the same log bases such as logbase3(2-3x)=logbase9(6x2-19x+2)

how would i make the same bases 3 what is formula thanks
2. (Original post by otrivine)
hi can someone tell me please the formula if you need to make the same log bases such as logbase3(2-3x)=logbase9(6x2-19x+2)

how would i make the same bases 3 what is formula thanks

Example 1:

If we want to make it to the base 5.

Example 2:

We want to convert it to the base 7.
3. (Original post by raheem94)

Example 1:

If we want to make it to the base 5.

Example 2:

We want to convert it to the base 7.
one question p=logbaseq16 how can you make the base q subject?

4. (Original post by TenOfThem)

do we need to know that for c2 cause i am solving this one where it says
p=logbaseq16 find in terms of P
a)logbaseq2
5. (Original post by otrivine)
do we need to know that for c2 cause i am solving this one where it says
p=logbaseq16 find in terms of P
a)logbaseq2

Remember,

Example:

You are asked to find in terms of .

So here is how we will do it,
.
We know equals so we can write as
6. (Original post by otrivine)
one question p=logbaseq16 how can you make the base q subject?

To make it the subject, use the rule, can be written as

Compare, with .
Here,

So now write it in the way , sub in the above data, we will get,

Now to remove the power of from , follow the following step:
7. (Original post by otrivine)
do we need to know that for c2
It is the core definition of logs

(Original post by otrivine)
cause i am solving this one where it says
p=logbaseq16 find in terms of P
a)logbaseq2

A Raheem said this does not require anything beyond knowing that 2^4 = 16
8. (Original post by TenOfThem)
It is the core definition of logs

A Raheem said this does not require anything beyond knowing that 2^4 = 16
thanks and last question ten of them this question
http://www.edexcel.com/migrationdocu...e_20110526.pdf

8)a) to do that how ? i got 2xpower3 for volume then what i do?
9. (Original post by otrivine)
thanks and last question ten of them this question
http://www.edexcel.com/migrationdocu...e_20110526.pdf

8)a) to do that how ? i got 2xpower3 for volume then what i do?
Let 'm' be the other side of the cuboid.

Remember,

We know volume equals 81, find an equation for 'm'.

L = 4(2x) + 4x +4m
10. (Original post by raheem94)
Let 'm' be the other side of the cuboid.

Remember,

We know volume equals 81, find an equation for 'm'.

L = 4(2x) + 4x +4m
yep got the answer thanks and why did u put m and not x
ANd for C2 what volume and lengths and area do we need to know to be able to apply like these questions?
11. (Original post by otrivine)
yep got the answer thanks and why did u put m and not x
ANd for C2 what volume and lengths and area do we need to know to be able to apply like these questions?
How do you know the other length will be 'x'?

Another length is specified as 'x' so i should now choose a different variable.

Just learn the formulas given in the book, to be honest, this part a of the question was o-level stuff.
12. (Original post by raheem94)
How do you know the other length will be 'x'?

Another length is specified as 'x' so i should now choose a different variable.

Just learn the formulas given in the book, to be honest, this part a of the question was o-level stuff.
thanks you are the best
but i did not get the question on logs where we said let p=logbaseq16 find in terms of p logbaseq2?
13. (Original post by otrivine)
thanks you are the best
but i did not get the question on logs where we said let p=logbaseq16 find in terms of p logbaseq2?
I don't have any idea of explaining you without doing a solution, so i will have to go for it.

So

You look to be posting a lot, so i think you should consider learning LaTex.
14. (Original post by raheem94)
I don't have any idea of explaining you without doing a solution, so i will have to go for it.

So

You look to be posting a lot, so i think you should consider learning LaTex.
thanks ok http://www.edexcel.com/migrationdocu...e_20090605.pdf
question 9)a) i did h=300/2r
and sub into the the area but is not working?
15. (Original post by otrivine)
thanks ok http://www.edexcel.com/migrationdocu...e_20090605.pdf
question 9)a) i did h=300/2r
and sub into the the area but is not working?
You need to work hard on your basics mate.

We know V= 300, find 'h' in terms of r^2.

Then find the surface area, i am assuming you are clear with the meaning of surface area.
16. (Original post by raheem94)
You need to work hard on your basics mate.

We know V= 300, find 'h' in terms of r^2.

Then find the surface area, i am assuming you are clear with the meaning of surface area.
how can i improve my basics for C2 please tell me raheem

what does A and H stand for in volume
17. (Original post by otrivine)
how can i improve my basics for C2 please tell me raheem

what does A and H stand for in volume
There is no magic wand to improve yourself.

I just used to read all the examples and solve all the questions from the book.

A stands for area.

The 'H' is 'h', and it is labelled in the diagram.
18. (Original post by raheem94)
There is no magic wand to improve yourself.

I just used to read all the examples and solve all the questions from the book.

A stands for area.

The 'H' is 'h', and it is labelled in the diagram.
shall i do all the mixed exercise?
19. (Original post by otrivine)
shall i do all the mixed exercise?

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 8, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How to predict exam questions

No crystal ball required

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams