if the equation is x^3-5x^2+4x-20 and I've been given the zero: -2i couldn't I just factor the equation out to (x-5) (x^2+4) and set them both to zero and find the zeroes are 5 and 2i or do I have to use synthetic division at some point?
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if the equation is x^3-5x^2+4x-20 and I've been given the zero: -2i couldn't I just factor the equation out to (x-5) (x^2+4) and set them both to zero and find the zeroes are 5 and 2i or do I have to use synthetic division at some point?
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