Find the remainder when x3 +3x3+3x+1 is divided by x+2x
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5+2x=0 2x=-5 x=5/2 replace x by -5/2 , we get x3+3x2+3x+1 = (-5/2)3+3(-5/2)2+3(-5/2)+1 = -125/8+75/4-15/2+1
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