Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 6 - Exponential, Logarithmic, And Inverse Trigonometric Functions - 6.3 Derivatives Of Inverse Functions; Derivatives And Integrals Involving Exponential Functions - Exercises Set 6.3 - Page 432: 37

Answer

$$\frac{{dy}}{{dx}} = \left( {{x^3} + {x^2} - 4x + 1} \right){e^x}$$

Work Step by Step

$$\eqalign{ & y = \left( {{x^3} - 2{x^2} + 1} \right){e^x} \cr & {\text{Find }}\frac{{dy}}{{dx}} \cr & \frac{{dy}}{{dx}} = \frac{{dy}}{{dx}}\left[ {\left( {{x^3} - 2{x^2} + 1} \right){e^x}} \right] \cr & {\text{By the product rule}} \cr & \frac{{dy}}{{dx}} = \left( {{x^3} - 2{x^2} + 1} \right)\frac{d}{{dx}}\left[ {{e^x}} \right] + {e^x}\frac{d}{{dx}}\left[ {\left( {{x^3} - 2{x^2} + 1} \right)} \right] \cr & \frac{{dy}}{{dx}} = \left( {{x^3} - 2{x^2} + 1} \right){e^x} + {e^x}\left( {3{x^2} - 4x} \right) \cr & {\text{Factor out }}{e^x} \cr & \frac{{dy}}{{dx}} = \left( {{x^3} - 2{x^2} + 1 + 3{x^2} - 4x} \right){e^x} \cr & \frac{{dy}}{{dx}} = \left( {{x^3} + {x^2} - 4x + 1} \right){e^x} \cr} $$
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