Something

C:\Documents and Settings\hlt32\My Documents>javac Poly.javaPoly.java:251: mulByx(Poly) in Poly cannot be applied to ()            P[n] = (P[n-1].polyMinus( (P[n-1].mulByx()).mulByCoeff(2*n-1), P[n-2].mulByCoeff(n-1) )).divByCoeff(n);                                        ^Poly.java:251: mulByCoeff(Poly,long) in Poly cannot be applied to (int)            P[n] = (P[n-1].polyMinus( (P[n-1].mulByx()).mulByCoeff(2*n-1), P[n-2].mulByCoeff(n-1) )).divByCoeff(n);                                                                            ^2 errors