Add by the horizontal method. 1) (x² – 3x – 5xy)+(6x² – 2xy + x) 2) (5a² +2)+(8a² – 1) Add or subtract by the vertical method. 3) (5x² +3) +(7x² – 1) 4) (4y² +2) – (-8y² +2y– 4)

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A: topic -quadratic functions

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A: topic - Linear equation in two variables

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A: Topic = Algebra

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