A) 1
B) 3
C) 5
D) 10
Correct Answer: B
Solution :
(b): \[\Leftrightarrow lo{{g}_{10}}5+lo{{g}_{10}}(5x+1)=lo{{g}_{10}}[(x+5)]+{{\log }_{10}}10\] \[\Leftrightarrow lo{{g}_{10}}5+lo{{g}_{10}}(5x+1)=lo{{g}_{10}}\left[ 10(x+5) \right]\] \[\Leftrightarrow 5(5x+1)=10(x+5)\] \[\Leftrightarrow 5x+1=2x+10\Leftrightarrow 3x=9\Leftrightarrow x=3.\]You need to login to perform this action.
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