Hi forum!

I was factoring this polynomial and i got stucked, please help me..

x^5 - 6x^4 + 5x^2 - 16x^2 - 12x - 16

what i did is i grouped them:

( x^5 - 6x^4 + 5x^2 ) + ( - 16x^2 - 12x - 16 )

Then i factored each group:

(x^3) ( x - 5 ) ( x - 1 ) + [ -4 ( 4x^2 - 3x - 4 )]

then i don't know what to do next...

i have tried doing trials and errors using synthetic division but i can't solve it.. help me please..

thanks forum