1. а) (4x-3y) + (4x+3y) = 4x-3y+4x+3y=8x
б) (3+2x-x^2)+(x^2-x) = 3+2x-x^2+x^2-x = x+3
2. а) (5x-y)-(5x+y) = 5x-y-5x-y=-2y
б) (4-x+3x^2)-(2x^2-x+4) = 4-x+3x^2-2x^2+x-4=x^2
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Answers & Comments
1. а) (4x-3y) + (4x+3y) = 4x-3y+4x+3y=8x
б) (3+2x-x^2)+(x^2-x) = 3+2x-x^2+x^2-x = x+3
2. а) (5x-y)-(5x+y) = 5x-y-5x-y=-2y
б) (4-x+3x^2)-(2x^2-x+4) = 4-x+3x^2-2x^2+x-4=x^2