A anthonye Jul 2010 614 5 Sep 30, 2014 #1 Hi; In synthetic division why do we change the sign of the divisor? say I have to divide a polynomial by (x - 2) why do I need to use +2?Thanks.

Hi; In synthetic division why do we change the sign of the divisor? say I have to divide a polynomial by (x - 2) why do I need to use +2?Thanks.

H HallsofIvy MHF Helper Apr 2005 20,249 7,909 Sep 30, 2014 #2 In "ordinary" division, we are dividing by x- a and subtract. In synthetic division we use "a" rather than "-a" and add rather than subtract.

In "ordinary" division, we are dividing by x- a and subtract. In synthetic division we use "a" rather than "-a" and add rather than subtract.