=X14(X+1)+X12(X+1)+X10(X+1)+X8(X+1)+X6(X+1)+X4(X+1)+X2(X+1)+(X+1)=(X14+X12+X10+X8+X6+X4+X2+1)(X+1)=[X12(X2+1)+X8(X2+1)+X6(X2+1)+X4(X2+1)+X2(X2+1)](X+1)=(X12+X8+X4+1)(X2+1)(X+1)=(X8+1)(X4+1)(X2+1)(X+1)
