Question 3850
 Two roots 4+i & 4-i. (r1 & r2)
 
 Their sum  = 8 and their product is 4^2 + 1 = 17.

 So, the equation is x^2 - 8x + 17 = 0 (ie x^2 - (r1+r2)x + r1 r2 =0

 Forget any any other way of solutions more than two lines about this kind of
 baby level questions.

 Also, there is no any reason you did not know the typing '+' sign. 
 
 Kenny