Question 393979
{{{p(x) = (x+  2)(x - (4+i))(x- (4-i)) = (x + 2)((x-4) - i)((x - 4) + i)}}}
={{{(x + 2)((x - 4)^2 - i^2) = (x+ 2)((x - 4)^2 + 1)}}}.

I leave it to you to finish the multiplication.