Calculus with Applications (10th Edition)

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

Chapter 4 - Calculating the Derivative - Chapter Review - Review Exercises: 50

Answer

\[{f^,}\,\left( x \right) = \,\frac{{\,\left( {\sqrt x + 1} \right){e^{\sqrt x }}\ln \,\left( {\sqrt x + 1} \right) - {e^{\sqrt x }}}}{{2\sqrt x \,\left( {\sqrt x + 1} \right)\,\,{{\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]}^2}}}\]

Work Step by Step

\[\begin{gathered} f\,\left( x \right) = \frac{{{e^{\sqrt x }}}}{{\ln \,\left( {\sqrt x + 1} \right)}} \hfill \\ Find\,\,the\,\,derivative\,\,of\,\,the\,\,\,function \hfill \\ {f^,}\,\left( x \right) = \frac{{\,\,\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]\,{{\left( {{e^{\sqrt x }}} \right)}^,} - {e^{\sqrt x }}\,{{\left( {\ln \,\left( {\sqrt x + 1} \right)} \right)}^,}}}{{\,\,{{\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]}^,}}} \hfill \\ Use\,\,the\,\,formulas\, \hfill \\ \frac{d}{{dx}}\,\,\left[ {\ln g\,\left( x \right)} \right] = \frac{{{g^,}\,\left( x \right)}}{{g\,\left( x \right)}}\,,\,\frac{d}{{dx}}\,\,\left[ {{e^{g\,\left( x \right)}}} \right] = {e^{g\,\left( x \right)}}{g^,}\,\left( x \right) \hfill \\ Then \hfill \\ {f^,}\,\left( x \right) = \frac{{\,\,\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]\,\left( {\,\frac{{{e^{\sqrt x }}}}{{2\sqrt x }}} \right) - {e^{\sqrt x }}\,\left( {\frac{{\frac{1}{{2\sqrt x }}}}{{\sqrt x + 1}}} \right)}}{{\,\,{{\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]}^2}}} \hfill \\ Simplifying \hfill \\ {f^,}\,\left( x \right) = \frac{{\frac{{{e^{\sqrt x }}\ln \,\left( {\sqrt x + 1} \right)}}{{2\sqrt x }} - \frac{{{e^{\sqrt x }}}}{{2\sqrt x \,\left( {\sqrt x + 1} \right)}}}}{{\,\,{{\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]}^2}}} \hfill \\ {f^,}\,\left( x \right) = \,\frac{{\,\left( {\sqrt x + 1} \right){e^{\sqrt x }}\ln \,\left( {\sqrt x + 1} \right) - {e^{\sqrt x }}}}{{2\sqrt x \,\left( {\sqrt x + 1} \right)\,\,{{\left[ {\ln \,\left( {\sqrt x + 1} \right)} \right]}^2}}} \hfill \\ \end{gathered} \]
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