Make c the subject...

[wantedcriminal03]

How do I make the c the subject of:

Q= sqrt((c+d)/(c-d))

I did Q^2= (c+d)/(c-d)
= (c+d)^2/(c^2-d^2)

and couldn't get any further...

[Denis]

I did Q^2= (c+d)/(c-d)
= (c+d)^2/(c^2-d^2)

NO!
Next step should be: Q^2(c - d) = c + d ; carry on...

[wantedcriminal03]

I tried that way aswell but I I got to c= Q^2 c - Q^2 d -d :?

[Denis]

HOW d'heck did you arrive at that ? :shock:

Q^2(c - d) = c + d

cQ^2 - dQ^2 = c + d

cQ^2 - c = dQ^2 + d

c(Q^2 - 1) = d(Q^2 + 1)

c = d(Q^2 + 1) / (Q^2 - 1)