SOLUTION: please help me solve: {{{ log( x ) + log ( (x-15) ) = 2 }}}

Question 331639: please help me solve:
Answer by jrfrunner(365) (Show Source): You can put this solution on YOUR website!

factor
(x-20)*(x+5)=0
either X=20 or X=-5
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check X=20, by substituting in original equation
Log 20 + log(20-15) =2
log 20 +log 5=2

2log10=2
2=2 verifies X=20 as a solution
--------------------
check X=-5
log(-5)+log(-5-15)=2 STOP!!!! log functions are define for values greater than 0,
so X=-5 is not a solution

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