Posted by Breanna on Sunday, December 30, 2012 at 5:21am.
Form a polynomial f(x) with real coeffiecients having the given degree and zeros.
degree 4, zeros 3, multiplicity 2; 6i
f(x)=a()
Can someone show how to do this. I have tried and do not have a clue. I am lost!!! So, please show work.

calculus  Steve, Sunday, December 30, 2012 at 6:00am
by the time you get to calculus, you should know how to use the roots to form a polynomial. If you tried, you should show what you have tried, and where you got stuck.
If a is a root of f(x)=0, (xa) is a factor of f(x).
Since complex roots come in pairs, 6i is also a root, so
f(x) = (x3)(x3)(x6i)(x+6i)
= (x3)^2 (x^2+36)
saying you do not have a clue indicates either
a) you have woefully neglected your studies, or
b) you are just lazy and want someone else to do your work, or
(c) both of the above.
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