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Rearranging Formulae HELP! GCSE level

utax22

Can someone please rearrange this to make p the subject of the formula?
Here's an image of the problem:

Thank you in advance.

Rearranging equations problem.png1.8KB

Reply 1

CplSkippy

That's one horrible question!

Hold on...doing it now!

Skips :smile:

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Reply 2

RKM21

Wow...furthest I got was t2 + 4 = 2p/p

Reply 3

mathscot

Original post by CplSkippy

That's one horrible question!

Hold on...doing it now!

Skips :smile:

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I've managed it tip get it
Will prompt you through the working
First square it

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Reply 4

mathscot

[QUOTE="mathscot;51334527"]I've managed it tip get it
Will prompt you through the working
First square it

Posted from TSR Mobile[/QUOTE

answering it directly won't help you next time

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Reply 5

mathscot

T^2 =(2P-4) /p squared it

PxT^2 = 2P -4. XP

PxT^2 -2P =-4. Took away 2P

P(t^2 - 2) =-4. Factorised the left hand side

P =-4/(t^2 - 2) divided by the amount in the bracket (from previous section)

Hope that helps. I've included the steps so you know what I've done and can replicate the steps on another question

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Reply 6

CplSkippy

ImageUploadedByStudent Room1414950667.663491.jpg

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Reply 7

CplSkippy

Agree with mathscot :smile:

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Reply 8

utax22

Thank you very much! I thought that this was impossible :biggrin:

Reply 9

Hunkybm

Original post by utax22

Can someone please rearrange this to make p the subject of the formula?
Here's an image of the problem:

Thank you in advance.

Hope this helps, please let me know if any of the steps are confusing.

image.jpg416.5KB

Reply 10

utax22

Original post by Hunkybm

Hope this helps, please let me know if any of the steps are confusing.

Yes, the step where it says: 'pt^2-2p+4=0'. I don't get how you did this at all and also, where did you get the =0 from? Thanks

Reply 11

Hunkybm

Original post by utax22

Yes, the step where it says: 'pt^2-2p+4=0'. I don't get how you did this at all and also, where did you get the =0 from? Thanks

Sorry, hope this makes it clearer

image.jpg503.1KB

Reply 12

CplSkippy

Ignore the =0 part! You factorise it due to common factors.

The line where it goes it t squared is because that is the opposite of square root, as this is what happens when you change sides, or alternatively, what is needed to cancel the square root sign on the original side.

Reply 13

utax22

Actually, don't worry, because I used the method that the other people were telling me and I get it now. Thanks to everyone for the contribution. This forum is great! :smile: