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x[x²-2x+x-2-2x-6-x²]≤8-3x²
x(-3x-8)≤8-3x²
-3x²-8x≤8-3x²
-8x≤8
x≥-1
b) (4-x)(4+x)-x(x+5)>3(x-1)-2(x+2)²
16-x²-x²-5x>3x-3-2(x²+4x+4)
16-2x²-5x>3x-3-2x²-8x-8
16-5x>-5x-11
16>-11