Question 62536
{{{ x^3 -x^2 + 16x - 16 }}}
Break this into two separate pieces ....
{{{ x^3 -x^2 }}} and {{{ + 16x - 16 }}}
Factor each piece
{{{ x^2(x-1) }}} and {{{ +16(x-1) }}}
Put the two pieces back together
{{{ x^2(x-1) + 16(x-1) }}}
The common factor is (x-1)
{{{ (x^2+16)(x-1) }}}
done