Question 1126964
{{{Q=(x-(highlight_green(-8)))(x-(highlight_green(1+i)))(x-(highlight_green(1-i)))}}}


{{{Q=(x+8)(x-1-i)(x-1+i)}}}

{{{(x+8)((x-1)-i)((x-1)+i)}}}

{{{(x+8)((x-1)^2-i^2)}}}

{{{(x+8)((x-1)^2+1)}}}

You can do the rest.