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Mathematics 15 Online
OpenStudy (marcelie):

Help please !!!

OpenStudy (marcelie):

@directrix

OpenStudy (anonymous):

\[log_3(x-2)+log_3(x-8)=3\]Using the addition rule:\[log_3((x-2)(x-8))=3\]Simplifying:\[log_3(x^2-10x+16)=3\]Removing the log:\[x^2-10x+16=3^3=27\]Rearranging:\[x^2-10x-11=0\]Factoring\[(x-11)(x+1)=0\]Giving us answers of x=11, x=-1. You can't take the log of a negative number, so our only solution is x=11.

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