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(x+2)³-x(x-1)²<=4x(2x+1)+1
x³+3·x²·2+3·x·2²+2³-x(x²-2x+1)<=8x²+4x+1
x³+6x²+12x+8-x³+2x²-x<=8x²+4x+1
8x²+11x+8<=8x²+4x+1
11x-4x<=1-8
7x<=-7/:7
x<=-1
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(x+2)³-x(x-1)²<=4x(2x+1)+1
x³+3·x²·2+3·x·2²+2³-x(x²-2x+1)<=8x²+4x+1
x³+6x²+12x+8-x³+2x²-x<=8x²+4x+1
8x²+11x+8<=8x²+4x+1
11x-4x<=1-8
7x<=-7/:7
x<=-1