Question 18439
 Factor
 {{{ x^5-x^4-13x^3+13x^2+36x-36 }}}
 = {{{ x^4 (x-1) - 13x^2(x-1) + 36(x-1)}}}
 = {{{(x-1) (x^4 - 13x^2 + 36)}}}
 = {{{(x-1) (x^2 -4)(x^2 -9)}}}
 = {{{ (x-1) (x-2)(x+2) (x-3)(x+3) }}}

 So, the other four roots are
 ....

 Kenny