Posted by lisa on Sunday, March 10, 2013 at 8:59am.
write a polynomial function in standard form with the given zeros. 12i,2

math  Reiny, Sunday, March 10, 2013 at 9:48am
complex numbers, like radicals, always come in their conjugate form
so if 2i is a zero so is +2i
so f(x) = (x1)(x2)(x  2i)(x + 2i)
the last two factors multiply for x^4 + 4
f(x) = (x1)(x2)(x^4 + 4)
expand if needed, I like it the way it is.

math  Damon, Sunday, March 10, 2013 at 10:58am
no comma there actually
zero when
x = 12i
x = 1+2i
x = 2
so I get
(x2)(x1+2i)(x12i)
(x2) (x^22x+5)

Go with Damon  math  Reiny, Sunday, March 10, 2013 at 11:35am
Just have to get stronger glasses.
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