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help express as a logarithm of a single value

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1 Answer

1)  The identity you need is log(ab) = log(a) + log(b)
 
log25+log28 = log2(8*5) = log240
 
2)  The identity you need for this one is: log(ab) = b*log(a)
 
3log106 = log10(63) = log10(216)
 
3) You need to know 2 things: 1000 = 103 and log10(10) = 1
 
log10(1000) = log10(103) = 3log10(10) = 3