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13-18 Express the quantity as a single logarithm.
13.
2 \ln x+3 \ln y-\ln z

User Wcarhart
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2 \ln x+ 3 \ln y - \ln z\\\\=\ln x^2 + \ln y^3 - \ln z\\\\=\ln(x^2 y^3) - \ln z\\\\=\ln \left( (x^2y^3)/(z) \right)

User Abuteau
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