Chapter 13, Trigonometric Ratios and Functions - Prerequisite Skills - Page 850: 7

$x=1.5$

Let's first move all the constants to one side of the equation. To do this, add 5 to both sides. That yields, $4^x=8$ We can rewrite this equation to make it easier for us, since $2^2=4$, and $2^3=9$ $2^{2x}=2^3$. Then, $2x=3$ And finally $x=1.5$