Question 148500
The root {{{x = 3i}}} is identical to {{{x =0+ 3i}}}. Since complex roots <font size=4><b>always</b></font> come in conjugate pairs, this means that the other guaranteed root is {{{x =0-3i}}} (which is the complex conjugate to  {{{x =0+ 3i}}}). So the other root is either {{{x =0-3i}}} or simply {{{x =-3i}}}