Question 1104915
Also need root {{{-3i}}} and another root {{{-sqrt(6)}}}.



{{{(x-3i)(x+3i)(x+sqrt(6))(x-sqrt(6))}}}

{{{(x^2-(9i^2))(x^2-6)}}}

{{{(x^2+9)(x^2-6)}}}

{{{x^4-6x^2+9x^2-54}}}

{{{highlight(x^4+3x^2-54)}}}