## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$-(x^4-8x^2-9)$
Factoring the $-1$, the given expression, $-x^4+8x^2+9 ,$ is equivalent to \begin{array}{l} -1(x^4-8x^2-9) \\\\= -(x^4-8x^2-9) .\end{array}