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b) (y²+5y-6) +(2y²-y+8) = y²+5y-6 + 2y²-y+8 = 3y²+4y+2
c) (5x²-ax+a²) +(3x²+2ax-3a²) = 5x² - ax +a² + 3x²+2ax-3a² = 8x²+ax-2a²