Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter 4 - Calculating the Derivative - 4.5 Derivatives of Logarithmic Functions - 4.5 Exercises: 32

Answer

\[{y^,} = \,\,\frac{4}{{\,\left( {4x - 3} \right)\ln 10}}\]

Work Step by Step

\[\begin{gathered} y = \log \,\left( {4x - 3} \right) \hfill \\ Differentiate \hfill \\ {y^,} = \,\,{\left[ {\log \,\left( {4x - 3} \right)} \right]^,} \hfill \\ Use\,\,the\,\,formula \hfill \\ \frac{d}{{dx}}\,\,\left[ {{{\log }_a}\left| {g\,\left( x \right)} \right|} \right] = \frac{1}{{\ln a}} \cdot \frac{{{g^,}\,\left( x \right)}}{{g\,\left( x \right)}} \hfill \\ Here\,\,\,g\,\left( x \right) = 4x - 3\,\,,\,\,a = 10 \hfill \\ Then \hfill \\ {y^,} = \frac{1}{{\ln 10}}\,\left( {\frac{{\,{{\left( {4x - 3} \right)}^,}}}{{4x - 3}}} \right)\,\, \hfill \\ {y^,} = \,\,\frac{1}{{\ln 10}}\,\left( {\frac{4}{{4x - 3}}} \right) \hfill \\ {y^,} = \,\,\frac{4}{{\,\left( {4x - 3} \right)\ln 10}} \hfill \\ \end{gathered} \]
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