Question 700444
If the roots are 6,i,and -i then the equation is:

{{{ (x-6)(x-i)(x+i) = 0 }}}

Multiplying out:
{{{ (x-6)(x^2+1) = 0 }}}
{{{ x^3 + x - 6x^2 -6  = 0 }}}
{{{ x^3 -6x^2 -x -6  = 0 }}}