## College Algebra (11th Edition)

$x-\ln4$ or $x=\ln2$
Let $u=e^x$ $e^{2x}-6^x+8=0$ $u^2-6u+8=0$ Factor. $(u-4)(u-2)=0$ $u=4$ or $u=2$ $e^x=4$ or $e^x=2$ $x-\ln4$ or $x=\ln2$