Add: 14x + 10y - 12xy - 13, 18 - 7x - 10y + 8xy, 4xy

14x + 10y – 12xy – 13, 18 – 7x – 10y + 8xy, 4xy

Answer

On combining the like terms and adding them we get

= 14x + 10y – 12xy – 13 + (18 – 7x – 10y + 8xy) + 4xy

= 14x + 10y – 12xy – 13 + 18 – 7x – 10y + 8xy + 4xy

= 14x – 7x + 10y– 10y – 12xy + 8xy + 4xy – 13 + 18

= x (14 – 7) + y (10 – 10) + xy(-12 + 8 + 4) + (-13 + 18)

= x (7) + y (0) + xy(0) + (5)

= 7x + 5

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