Question 5071
This question assumes that the numbers a, b, c are real number. 

Because the roots of the equation are complex, they are of form 2+i and 2-i. 

The equation is a trinomial that is a product of two binomials 

{{{(x-(2+i))*(x-(2-i)) = x^2-((2+i)+(2-i))x + (2-i)*(2+i) = x^2-4x+4-(i^2) = x^2 - 4x+5}}}