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# Make c the subject.... watch

1. don't worry done it
2. Square both sides, multiply by (c-d), expand out, then group all the terms so you have:

{stuff with no c term} = {stuff with a c term)

Then factor out 'c' from the RHS to get

{stuff with no c term} = {more_stuff with no c term} c

Then c = {stuff with no c term} / {more_stuff with no c term}

If you get stuck, post your working.
3. Try working it out on your own first. If not, then VV
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Q^2= (c+d)/(c-d)
Q^2(c-d) = (c+d)
Q^2c - Q^2d = (c+d)
Q^2c -(c+d) = Q^2d
Q^2c -c = Q^2d-d
c(Q^2-1) = d(Q^2-1)
c= [d(Q^2-1)]/(Q^2-1)
4. (Original post by Hippysnake)
Try working it out on your own first. If not, then VV
Spoiler:
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Q^2= (c+d)/(c-d)
Q^2(c-d) = (c+d)
Q^2c - Q^2d = (c+d)
Q^2c -(c+d) = Q^2d
Q^2c -c = Q^2d-d
c(Q^2-1) = d(Q^2-1)
c= [d(Q^2-1)]/(Q^2-1)

5. (Original post by Totally Tom)

OH **** NOOOOOOOOOOOOOOOOOOOOOOOOOO.

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