Please answer, i'm timed (EDGE 2022)
2 answers:
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Factoring f(x) would give a factor (x-1-2i), so you can divide f(x) by this, leaving (x-3)(x+4)(x-1+2i), so the other roots are:
x=3
x=-4
x=1-2i
x=3
x=-4
x=1-2i