Find D when 8x^3-12x^2-2x+D is divided by 2x+1 when the remainder is -2
8x3-12x2-2x+D...(1)
2x+1...(2)
Assume 2x+1=0 so x=-1/2
8x3-12x2-2x+D=-2... when divided by (2)
substitute -1/2 into all X values
rearrange to find D
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