SOLUTION: I am having trouble with this toic can someone please help me. Solve logarithmic equation log x + log(x+9) = 1 Thank you inadvance for your help.

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Question 115200: I am having trouble with this toic can someone please help me.
Solve logarithmic equation
log x + log(x+9) = 1
Thank you inadvance for your help.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
using rules for logarithms, x(x+9)=10 ___ x^2+9x-10=0

factoring gives (x+10)(x-1)=0

REMEMBER : logarithms are NOT defined for negative numbers