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Mathematics 8 Online
OpenStudy (anonymous):

expanding logs

OpenStudy (anonymous):

condense \[1/3 logx-2\log(x+2)-4\log(y+2)\]

OpenStudy (phi):

move the coefficients inside the logs use the rule \[ a \log(b) = \log(b^a) \]

OpenStudy (anonymous):

does it matter if in base of three

OpenStudy (phi):

no.

OpenStudy (anonymous):

so log1/3x-2log2x+4-log4y+8

OpenStudy (phi):

try again the coefficient becomes an *exponent* example: the first log becomes \[ \log(x^\frac{1}{3}) \]

OpenStudy (anonymous):

\[logx ^{1/3}-Log(x+2)^{2}-Log(y+2)^{4}\] \ \

OpenStudy (phi):

ok, now if all the logs are the same base you can use the rule \[ \log(a) - \log(b)\ = \log(\frac{a}{b} )\]

OpenStudy (anonymous):

but can i have loga-logb-logc= log a/b/c

OpenStudy (anonymous):

the three logs are throwing me off

OpenStudy (phi):

yes. a/b/c is the same as a/(b*c) another way to do this is factor out the minus sign \[ \log(x^(1/3) - (\log( (x+2)^2 ) +\log( (y+2)^4) )\] and combine the logs inside the parens using log(a)+log(b)= log(a*b)

OpenStudy (anonymous):

okso...|dw:1378675998926:dw|

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