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V(x+3)(-x+7) <4
(V -x²+4x+21)² < 4²
-x²+4x+21 < 16
-x+4x+21-16 < 0
-x+4x+5 <0
(x.+1)(-x +5) < 0
x< -1. atau. x > -5
nb: V= akar