Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 4 - Review - Exercises - Page 389: 63

Answer

$x=-4$ and $x=2$

Work Step by Step

$x^{2}e^{2x}+2xe^{2x}=8e^{2x}$ Take $8e^{2x}$ to the left side: $x^{2}e^{2x}+2xe^{2x}-8e^{2x}=0$ Take out common factor $e^{2x}$ from the left side: $e^{2x}(x^{2}+2x-8)=0$ Set both factors equal to $0$ and solve each individual equation for $x$: $e^{2x}=0$ There are no values of $x$ that make this equation true. $x^{2}+2x-8=0$ Solve by factoring: $(x+4)(x-2)=0$ $x+4=0$ $x=-4$ $x-2=0$ $x=2$ The solutions found are $x=-4$ and $x=2$
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