Question 998450

Really need help on logarithm problems!

log(x)+log(x-15)=2

ln(x+12)-ln(x)= ln(x+5)

e^2x+2e^x-3=0
<pre>Too many problems
1. {{{highlight_green(x = 20)}}}       OR    x = - 5 (ignore)
2. Apply the same method/concept in 1.
3. {{{e^(2x) + 2e^x - 3 = 0}}}
  -  Factor this to get: {{{(e^x - 1)(e^x + 3) = 0}}}
  -  Set each factor equal to 0
  -  Solve for x and IGNORE any EXTRANEOUS solution