Complex roots occur in conjugate pairs.
OK, Mark M., thanks for the suggestion.
a+bi and a-bi is a pair of complex conjugates.

Fiona P.
asked 11/27/21Information is given about a polynomial f(x) whose coefficients are real numbers. Find the remaining zeros of f.
Degree 5; Zeros: -7, i, 7i
Complex roots occur in conjugate pairs.
OK, Mark M., thanks for the suggestion.
a+bi and a-bi is a pair of complex conjugates.
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Mark M.
What is a conjugate pair? That might be the crux of the problem.11/27/21