x^2 -kx-k-1=0 . . . . ?????????? k=integer ?????????? . . . ???????? yu want the zeroes av the quadratik equashun ?????? . . . for k=0, x^2-1=0, so x=+-1 . . . if k=-1, yu get x^2 +x=0, so x=0 or x=-1 . . . evree k will giv yu sumthun, mae be reel, mae be komplex