You are Here: Home >< Maths

# Is it possible to make t the subject of x=t^3-8t? watch

1. (Original post by Xin Xang)
That seems a bit much.

Are you suggesting that a poster who has repeatedly trolled the maths forum should not be banned ... Even after previous warning
2. (Original post by Mr M)
He's been at it all day.
And on previous days
3. (Original post by Mr M)
He's been at it all day.
(Original post by TenOfThem)
Are you suggesting that a poster who has repeatedly trolled the maths forum should not be banned ... Even after previous warning
(Original post by TenOfThem)
And on previous days
Ok sorry I didn't know. It sounded as if they were being banned for questioning James22's maths ability from what I could gather.
4. S'pose I'll get clearing up
5. (Original post by Nirgilis)
S'pose I'll get clearing up
6. (Original post by TenOfThem)
. Don't think we've had this many reports in such a small amount of time since the last exam period
7. (Original post by Nirgilis)
. Don't think we've had this many reports in such a small amount of time since the last exam period
Did you clear up the other thread inferred too?
8. (Original post by TenOfThem)
Did you clear up the other thread inferred too?
Just getting round to it . Seems your reports from yesterday still need attention too, looking at the logs . I'll deal with everything now
9. (Original post by TenOfThem)
That is not the reason

If x=t+3 then we could rearrange to get t=x-3
Well. The same is possible for the equation above to get a general one. But as far as I can see the parameter t would be both on the right and on the left side then. That is to say there is not a concrete value for parameter t, there are more than one. So there are different values of t for the same value of variable x. Is that the reason?
10. (Original post by Xin Xang)
Ok sorry I didn't know. It sounded as if they were being banned for questioning James22's maths ability from what I could gather.
Can this be a new rule?
11. (Original post by Kallisto)
Well. The same is possible for the equation above to get a general one. But as far as I can see the parameter t would be both on the right and on the left side then. That is to say there is not a concrete value for parameter t, there are more than one. So there are different values of t for the same value of variable x. Is that the reason?
That is exactly the reason.

12. (Original post by Xin Xang)

That is only 1 of 3 poossible solutions.
13. (Original post by james22)
That is only 1 of 3 poossible solutions.
But it is possible to make t the subject as I have shown (cut and pasted), correct?
14. (Original post by Xin Xang)
But it is possible to make t the subject as I have shown (cut and pasted), correct?
No, because t can take 3 possible values. You only gave 1 of them. Rearanging should not lose information, but losing 2/3 solutions is losing information.
15. (Original post by james22)
No, because t can take 3 possible values. You only gave 1 of them. Rearanging should not lose information, but losing 2/3 solutions is losing information.
I think you should look at post 18
16. (Original post by TeeEm)
I think you should look at post 18
I don't consider something to be a rearangement unless all steps are reversable. Rearangement should be an equivalence relation, and it cannot be so if information is lost.
17. (Original post by james22)
I don't consider something to be a rearangement unless all steps are reversable. Rearangement should be an equivalence relation, and it cannot be so if information is lost.
Can you rearrange y=x2 for x?
18. (Original post by TeeEm)
Can you rearrange y=x2 for x?
No, not without restrictions on what values x can take.
19. (Original post by james22)
No, not without restrictions on what values x can take.
I have nothing else to say ...

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:
Updated: January 26, 2015
Today on TSR

### Struggling to get going with your revision?

Get going with the all day revision thread

### Uni strikes! How do they affect you?

Discussions on TSR

• Latest
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE