1. ## higher degree factorization

how to solve: z^4+13z^2+36

2. ## Re: higher degree factorization

Originally Posted by baidyasuyam
how to solve: z^4+13z^2+36
$u=z^2$

$u^2+13u+36$

$(u+9)(u+4)$

$(z^2+9)(z^2+4)$

Thats as far as it will go assuming real numbers. If z can be complex

$(z+3\imath)(z-3\imath)(z+2\imath)(z-2\imath)$