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# C2 - Logarithms

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1. (Original post by RDKGames)
Your method is correct, you rounded too much. I did too lol.

I used exact values on my calc and got x to be 36.777... which is 36.8 to 3 d.p.
Nvm, realised mistake soon enough.
Kept doing cos (5/8) in calculator when I was meant to do 5/8 because the value was already given,

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2. (Original post by Chittesh14)
Nvm, realised mistake soon enough.
Kept doing cos (5/8) in calculator when I was meant to do 5/8 because the value was already given,

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I was working on ano's sin(3) thing with nested radicals but well done you noticed where you went wrong
3. (Original post by RDKGames)
I was working on ano's sin(3) thing with nested radicals but well done you noticed where you went wrong
Lol . Btw, what does it mean when it says "find the value of x for which AC has a minimum value."

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4. (Original post by Chittesh14)
Lol . Btw, what does it mean when it says "find the value of x for which AC has a minimum value."

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Can't say without a context, it can mean different things.
5. (Original post by Chittesh14)
Lol . Btw, what does it mean when it says "find the value of x for which AC has a minimum value."

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Is it -1?
6. (Original post by RDKGames)
Can't say without a context, it can mean different things.
Ok. I understand it, but I don't know how to solve it lmao.

AC^2 = x^2 - x + 7 = 0
Find the value of x for which AC has minimum value.

I get it so what value of x will give AC its lowest value possible. But, how do I work that out? The answer is 1/2.

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7. (Original post by Chittesh14)
Ok. I understand it, but I don't know how to solve it lmao.

AC^2 = x^2 - x + 7 = 0
Find the value of x for which AC has minimum value.

I get it so what value of x will give AC its lowest value possible. But, how do I work that out? The answer is 1/2.

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I'm unsure how you got there, but it makes sense. Here you need to differentiate in respect to x. In order to get the minimum point, make that differential =0.
8. (Original post by RDKGames)
I'm unsure how you got there, but it makes sense. Here you need to differentiate in respect to x. In order to get the minimum point, make that differential =0.
But, that isn't a part of what I'm learning. This chapter is called sine and cosine rule lol... . Dam man I'm endangered haha. I'll send you the whole question and a similar question that I encountered before and see if you can work out the answer from one of them and then both of them. Maybe, u will understand when I send a question over.

I am going to eat now so I'll send in 25 minutes .

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9. (Original post by Chittesh14)
But, that isn't a part of what I'm learning. This chapter is called sine and cosine rule lol... . Dam man I'm endangered haha. I'll send you the whole question and a similar question that I encountered before and see if you can work out the answer from one of them and then both of them. Maybe, u will understand when I send a question over.

I am going to eat now so I'll send in 25 minutes .

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This is Core 2, right? Differentiation comes from Core 1.
10. (Original post by RDKGames)
This is Core 2, right? Differentiation comes from Core 1.
Yeah I know. But, are u expected to use core 1 knowledge in a core 2 exam is what I'm wondering?

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11. (Original post by Chittesh14)
Yeah I know. But, are u expected to use core 1 knowledge in a core 2 exam is what I'm wondering?

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Core 1 acts as the basis to Core 2, 3 and 4 so yes, you do.

Alternatively, you can complete the square to find the minimum point of that quadratic.
12. (Original post by RDKGames)
Core 1 acts as the basis to Core 2, 3 and 4 so yes, you do.

Alternatively, you can complete the square to find the minimum point of that quadratic.
Thanks bro! Completing the square sounds better even though I can do both lolz I think.

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13. (Original post by RDKGames)
I was working on ano's sin(3) thing with nested radicals but well done you noticed where you went wrong
How you getting along with that problem?
14. (Original post by Ano123)
How you getting along with that problem?
15. (Original post by RDKGames)
What rule?
16. (Original post by Ano123)
What rule?
The root(a+2root(b))=root(x+y+2root( xy))=root(x)+root(y)
17. (Original post by RDKGames)
The root(a+2root(b))=root(x+y+2root( xy))=root(x)+root(y)
Didn't use it. Well you'll have to post your solution so we can take a look. Good job.
18. (Original post by Ano123)
Didn't use it. Well you'll have to post your solution so we can take a look. Good job.
I'm having two issues uploading the image directly to the thread; the first uploads sideways and the rest are not valid attachments that lead anywhere. Any way around this?
19. (Original post by RDKGames)
I'm having two issues uploading the image directly to the thread; the first uploads sideways and the rest are not valid attachments that lead anywhere. Any way around this?
What file is the image, did you take the picture using your phone, or is it on your computer?
20. (Original post by Ano123)
What file is the image, did you take the picture using your phone, or is it on your computer?
Took them on my iphone, uploaded them to my computer. They are JPG format.

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