COR. 01

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a. $\ln\left(\dfrac 1{25}\right) = -\ln(25) = -\ln(5^2) = -2\ln(5)$.

b. $\ln(35) - \ln(7) = \ln\left(\dfrac{35}7\right) = \ln(5)$.

c. $\ln(125) - \ln\left(\sqrt 5\right) = \ln(5^3) - \dfrac12\ln(5) = 3\ln(5) - \dfrac12\ln(5)$
$= \dfrac52\ln(5)$.

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code : 2723