edit : the rest is zero : la console is right, but, after check :
it's : 3x^2 + 13x + 4 .... and not + 5 (degree 0 term)
3x^3 - 2x^2 - 61x - 20 | x - 5
-3x^3+15x^2................3x^2 + 13x + 4
........ 13x^2 - 61x -20
.........-13x^2 +65x
......................4x -20
.....................-4x +20
.............................0
finally :
(3x^3 - 2x^2 - 61x - 20) / (x - 5) = 3x^2 + 13x + 4
Hope this helps any sorry how its all scattered
