Help with these algebra 1 equations please.

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1. (x^2 + 3x + 2x^3 + 7) + (5x - 3x^2 - 6) =

= 2x^3 + (1-3)x^2 + (3 + 5)x + 7 - 6 =

= 2x^3 -2x^2 + 8x + 1 (the answer b)


2. 4x^3 + 6x - x^2 - ( x^2 + x^3 - 2x) =

= 4x^3 + 6x - x^2 - x^2 - x^3 + 2x =

= (4 - 1)x^3 + (- 1 - 1)x^2 + (2 + 6)x =

= 3x^3 - 2x^2 + 8x (the answer b)