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6 steps: (1) To add polynomials: combine LIKE TERMS. (2) (3x²+5x-2) + (x²-3x+4). Group like terms: (3x²+x²) + (5x-3x) + (-2+4) = 4x² + 2x + 2. (3) To subtract: distribute the negative to ALL terms of the second polynomial. (4) (3x²+5x-2) - (x²-3x+4) = 3x²+5x-2 - x²+3x-4 = 2x²+8x-6. (5) Common mistak

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