log(x) - (1/2)log(x+4) = 1
log(x) - log(x+4) 1/2 = 1
log[x/(x+4) 1/2] = 1
Now I need to know what base it is in. I will assume base 10
x/(x+4) 1/2 = 10
etc
This will lead to a quadratic equation that you will have to solve.
You should work through a unit on logs maybe
http://www.mathsisfun.com/algebra/logarithms.html
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