Add the following expression using horizontal method: x-2y-z,x+y+zand-x+y+2z
Given expressions: x-2y-z,x+y+zand-x+y+2z
Adding using the horizontal method:
x-2y-z+x+y+z-x+y+2z
=x+x-x-2y+y+y-z+z+2z
=x+2z
Hence, the sum of the given expressions is x+2z