## Calculus: Early Transcendentals 8th Edition

$x=\frac{3}{2}i$ or $x=-\frac{3}{2}i$
$4x^2+9=0$ $4x^2=-9$ $x^2=-\frac{9}{4}$ $x=\sqrt(\frac{9}{4})i$ or $x=-\sqrt(\frac{9}{4})i$ $x=\frac{3}{2}i$ or $x=-\frac{3}{2}i$