Finding a polynomial of a given degree with given zeros.

label Algebra
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Find a polynomial f(x) of degree 3 with real coefficients and the following zeros.

-1 , 2i

Simplify completely including i's.

Oct 17th, 2015

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f(x) = (x+1) (x-2i) (x+2i)

f(x) = (x+1) (x^2+4)

 f(x) = (x^3+ 4 x^2+x^2+4)

 f(x) = x^3+ 5 x^2+4 answer


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Oct 17th, 2015

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