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Using the given zero, find all other zeros of f(x).
2i is a zero of f(x) = x^4  45x^2  196
 one year ago
 one year ago
Using the given zero, find all other zeros of f(x). 2i is a zero of f(x) = x^4  45x^2  196
 one year ago
 one year ago

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whpalmer4Best ResponseYou've already chosen the best response.0
The imaginary zeros come in conjugate pairs, so 2i and 2i are zeros. To be zeros, they must be part of a (x^2 + a^2) expression, and plugging a = 2i into that gives (x^2 + 4). Now just divide the original polynomial by (x^2+4) and factor what is left.
 one year ago

precalBest ResponseYou've already chosen the best response.1
dw:1359424829774:dw7 is a zero
 one year ago

precalBest ResponseYou've already chosen the best response.1
ok found my mistake (2i)(98i) is +196 and there is my missing zero
 one year ago
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