Each zero 'a' gives a factor 'x-a', and noting complex zeros come in

conjugate pairs:



(x-(-5+2i))(x-(-5-2i))*(x+2)(x+2)



... after combining the terms with complex roots, and multiplying (x+2)(x+2) ...



=  * 



... after expansion and subsquent simplification ...



= 



( checked on WolframAlpha:  ' factor x^4+14x^3+73x^2+156x+116 ' yields

  )  

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