Posted by student on Monday, June 24, 2013 at 3:09am.
solve x^48x^3+64x105=0 given that 2i is one solution.
must be tired cause my steps are not calculating correctly

algebra  Steve, Monday, June 24, 2013 at 4:52am
what you should do is show how far you got, if you want help.
another root is necessarily 2+i, so
(x^24x+5) divides x^48x^3+64x105
In fact,
x^48x^3+64x105 = (x^24x+5)(x^24x21)
Now it's a piece o' cake, no?
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