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x²>-16
x>4 x>-4
B. -3/5x²+9/5x≤0
3/5x(-x+3/5)≤0
3/5x≤0
x≤0
C. -2x²+10x-8>0
-2x²+10x>8
x(-2x+10)>8
x>8/-2x+10
x>4/-x+5