Resolva :

a) -x² - 8x -16 < 0

b) -2x² + 4 ≤ -3x +2 ≤ - x² -4x +4

c) (x²- 2x + 8) . (x²- 5x +6) . (x² -4) < 0

d) (-x² + x) / ( x² +2x + 3) 
≥ 0
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