Question 1175283
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Ignore tutor @MathTherapy's pronouncement of what the correct answers are.  He likes to demonstrate his presumed superiority by declaring that other tutors' answers are incorrect.<br>
In this problem, his answers are NOT correct; the response from the other tutor shows the correct answers.<br>
If the problem stated that the given solutions were the solutions to an equation with real coefficients, then the solution x=3i would require a complementary factor of x=-3i -- and tutor @MathTherapy's response would be correct.<br>
But the problem says nothing about the coefficients of the equation for which the solutions are given.<br>
So, for the question as stated, the other tutor's answers are exactly correct.<br>