You can
put this solution on YOUR website!
You cannot use ordinary synthetic division unless you are
dividing by a binomial of the form x ± a. You cannot divide
by trinomials using ordinary synthetic division. You must
use LONG division.
You can only divide them after setting them up like this,
using long division:
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x²-2x-1)3x5+0x4-2x3-x2+4x+4
Edwin