You are Here: Home >< A-levels

# Rearranging Help

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. if you were to have as an example: C=2(x+a)

Why can this not be written as C/2-a
2. (Original post by JackLeggett)
if you were to have as an example: C=2(x+a)

Why can this not be written as C/2-a
It can be written that way. They are exactly the same.
3. (Original post by JackLeggett)
if you were to have as an example: C=2(x+a)

Why can this not be written as C/2-a
They can but writing it as C-2a/2 is clearer so preferred
4. (Original post by JackLeggett)
if you were to have as an example: C=2(x+a)

Why can this not be written as C/2-a
5. same ting
6. (Original post by abc_123_)
They can but writing it as C-2a/2 is clearer so preferred
Thanks for help. When the equation is C=2 √h(2x-h). ( √h(2x-h) is all rooted) I have got it down to c^2/4=h(2x-h), where do I go from here?
7. (Original post by JackLeggett)
Thanks for help. When the equation is C=2 √h(2x-h). ( √h(2x-h) is all rooted) I have got it down to c^2/4=h(2x-h), where do I go from here?
What are you trying to do?
8. (Original post by B_9710)
What are you trying to do?
Sorry, make x the subject, I have c^2/2h+h/2=x is this correct
9. (Original post by JackLeggett)
Thanks for help. When the equation is C=2 √h(2x-h). ( √h(2x-h) is all rooted) I have got it down to c^2/4=h(2x-h), where do I go from here?
Can u Write down the whole equation please xx
10. (Original post by abc_123_)
Can u Write down the whole equation please xx
$C=2\sqrt{h(2x-h)}$

I have solved it to

$\frac{C^2}{2h}+\frac{h}{2}=x$

is this correct??
11. (Original post by JackLeggett)
$C=2\sqrt{h(2x-h)}$

I have solved it to

$\frac{C^2}{2h}+\frac{h}{2}=x$

is this correct??
Nope. What happens to the 2 in front of the root when you square both sides? You seemed to have ignored it completely.
12. (Original post by JackLeggett)
$C=2\sqrt{h(2x-h)}$

I have solved it to

$\frac{C^2}{2h}+\frac{h}{2}=x$

is this correct??
I think that's right x
13. (Original post by abc_123_)
Yea that's right xx
Well done
Nope.
14. (Original post by RDKGames)
Nope.
What?
First attempt = c^2 / 8h
2nd attempt = c^2 / 2h
15. (Original post by abc_123_)
What?
It's incorrect and you said it's correct.
16. (Original post by RDKGames)
It's incorrect and you said it's correct.
I thought it was … sorry
17. (Original post by RDKGames)
Nope. What happens to the 2 in front of the root when you square both sides? You seemed to have ignored it completely.
?? I divided C by the 2 in front of the root?? Also I posted this question on another thread with the same answer and you said it was correct, I am not being rude I am just confused??
18. (Original post by JackLeggett)
?? I divided C by the 2 in front of the root?? Also I posted this question on another thread with the same answer and you said it was correct, I am not being rude I am just confused??
I said it was correct because you the way you wrote the question made me miss out on the 2 as it was so close to the equals sign while the rest of the equation was separated by a space hence I ignored it so your answer was correct in that case. I edited that comment soon after I saw your post here and noticed the 2 in front.

Okay so you divide by 2, still didn't get the right answer as you didn't square LHS properly.
19. (Original post by JackLeggett)
?? I divided C by the 2 in front of the root?? Also I posted this question on another thread with the same answer and you said it was correct, I am not being rude I am just confused??
Correct answer is , of course there are alternative forms that are equivalent to this.
20. (Original post by RDKGames)
I said it was correct because you the way you wrote the question made me miss out on the 2 as it was so close to the equals sign while the rest of the equation was separated by a space hence I ignored it so your answer was correct in that case. I edited that comment soon after I saw your post here and noticed the 2 in front.

Okay so you divide by 2, still didn't get the right answer as you didn't square LHS properly.
Oh Ok thanks

## 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: September 18, 2016
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 does exam reform affect you?

From GCSE to A level, it's all changing

Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets