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b. 4x²-2x²+2x+4x-3+5 = 2x²+6x+2
= x + 1
b. (-2x²+ 4x + 5) + (4x² + 2x -3) = -2x²+ 4x + 5 + 4x² + 2x -3
= 2x² + 6x + 2