For the below given division of polynomial, Find the value of a.
x−1x2−5x+ax3−6x2+11x−6 x3−5x2+ax–––––––––––––––2 −x2+5x−6 −x2+5x−a––––––––––––––– 0
x−1x2−5x+6x3−6x2+11x−6 x3−5x2+6x–––––––––––––––2 −x2+5x−6 −x2+5x−6––––––––––––––– 0