p = [E^(2) R]/(r + R)^2
I began by multiplying both sides by (r +R)^2.
I then got this:
p(r + R)^2 = E^(2) R
I then simplified the left side and got this:
pr^2 + 2rR + R^2 = E^2 R
I subtracted pr^2 from both sides and got this:
2rR + R^2 = E^2 R - pr^2
I then subtracted both sides by E^2 R.
2rR + R^2 - E^2 R = -pr^2
I then factored out the upper case letter R on the left side and got this:
R(2r + R - E^2) = -pr^2
This is where I got stuck.
Notice that there is another upper case letter R inside the parentheses.
Where do I go from there?