Question 679923
ln x + ln(x+4)=0 
-----
ln[x(x+4)] = 0
-----
x(x+4) = 10^0
-----
x^2+4x = 1
---
x^2+4x-1 = 0
Use the quadratic formula:
x = [-4 +- sqrt(16-4*(-1)]/2
----
x = [-4 +- sqrt(20)]/2
----
x = [-2 +- 2sqrt(5)]
-----
Positive solution:
x = -2 + 2sqrt(5) = 2.4721...
Cheers,
Stan H.