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x-2/2 - x²+2x+1≤1-x² |*2
x-2-2x²+4x+2≤2-2x² |+2
5x≤2 |:5
x≤2/5
b) (x-3)²- (x+2)²≥0
x²-6x+9 - x²+4x+4≥0
-2x≥-13 |:(-2)
x≤6,5
c) |x-3| ≥ 5 +3
x≥8
d) |6-x| ≤ 4 |-6
-x≤-2
x≥2