## Algebra and Trigonometry 10th Edition

$f(x)=(x+7i)(x-7i)$ The zeros: $x=-7i$ $x=7i$
$f(x)=x^2+49$ $f(x)=x^2-(7i)^2$ $f(x)=(x+7i)(x-7i)$ The zeros: $0=(x+7i)(x-7i)$ $x+7i=0$ $x=-7i$ $x-7i=0$ $x=7i$