# Math Help - Help needed on simple algebra

1. ## Help needed on simple algebra

Just a simple question. How do we find R if it is given by the equation

[(100-R)^0.5]+[(400-R)^0.5]=20

I have tried taking the natural logs on both sides of the equation, but it does not return the correct answer, which is 93.75.

2. Originally Posted by kenobings
Just a simple question. How do we find R if it is given by the equation

[(100-R)^0.5]+[(400-R)^0.5]=20

I have tried taking the natural logs on both sides of the equation, but it does not return the correct answer, which is 93.75.