d. f.
a. d. f.
3 2 3 2
crosses touches crosses touches crosses
d.
d.
b. c. e. f.
The degree of the polynomial is 3. By the fundamental theorem of algebra, the function has three roots. Two roots are given, so there must be one root remaining. By the complex conjugate theorem, imaginary roots come in pairs. The final root must be real.
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