Find the remainder when x3-4x2+12x+7 is divided by x+1/2

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put the value of x= -1/2 = x^3-4x^2+12x+7 = (-1/2)^3-4(-1/2)^2+12*-1/2+7= -1/8-4*1/4-6+7= -1/8-1+1= ans.=-1/8
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