2) 1. a³+3a²+9a-3a²-9a-27 = a³ - 27
2. 8-4x+2x²+4x-2x²+x³ = 8 + x³
3) x³+x²+x-x²-x-1 = x³ - 1 = 2³ - 1 = 8 - 1 = 7
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2) 1. a³+3a²+9a-3a²-9a-27 = a³ - 27
2. 8-4x+2x²+4x-2x²+x³ = 8 + x³
3) x³+x²+x-x²-x-1 = x³ - 1 = 2³ - 1 = 8 - 1 = 7