Solve D = (root) | R - r / R + r for R

[Boberto96]

So I have the equation: by the way, "(root)" = sqrt because i cant find the symbol for it. D = (root)R-r/R+r
Trying to solve for R.

So far I have come up with squaring both sides and then multiplying by (R+r) to get D^2(R+r) = R-r and then I figured it best to use the distributive property to multiply through and get D^2R + D^2r = R-r

That is where I get stuck, Im not sure where to go. I'm out of practice with my math and haven't done anything more than simple addition and subtraction for about 4 years (history major). Any help is very much appreciated.

Thanks,
Rob.

 

[skeeter]

Re: D=(root)|R-r/R+r

So I have the equation: by the way, "(root)" = sqrt because i cant find the symbol for it. D = (root)R-r/R+r
Trying to solve for R.


So far I have come up with squaring both sides and then multiplying by (R+r) to get D^2(R+r) = R-r and then I figured it best to use the distributive property to multiply through and get D^2R + D^2r = R-r

you're almost there ... get both terms with R on the same side, all the other terms without R on the opposite side. then factor an R out of those two terms ... it will be rather obvious what to do next.