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= 3ab - 5ab + 2xy + 8xy
= - 2ab + 10xy
b) (x + 2y - 3z) + (2x + 4y + 2z)
= x + 2x + 2y + 4y - 3z + 2z
= 3x + 6y - z
= 3ab + 2xy - 5ab + 8xy
= -2ab + 10xy
b. x + 2y - 3z + (2x+ 4y + 2z)
= x + 2y - 3z + 2x + 4y + 2z
= 3x + 6y - z