This problem is not written correctly.  The given values are zeroes instead of coefficients.  Not all of them are real.
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document.write( "To find a polynomial of least degree with the roots -4, 2i and -2i, subtract the zeroes from x to find factors.
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document.write( "x=-4 ---> x+4
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document.write( "x=2i --->x-2i
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document.write( "x=-2i ---> x+2i
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document.write( "Multiply the factors together.  It's wise to multiply the factors involving imaginary numbers together first.
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document.write( "(x-2i)(x+2i) = 
 and since 
 that's 
.
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document.write( "Since some number, a, may have been factored out of each term, multiply the whole thing by a.  
 
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