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W(x)= ax³ +x² -2x -1 r= -1/2
W(-1/2)= a·(-1/2)³ +(-1/2)² -2·(-1/2) -1=0
-1/8a +1/4 +1 -1=0
-1/8 a+1/4=0 /·(-8)
a -2=0
a=2