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Sagot :
Since we want a polynomial p(x) with zeros -2,1 and 4, we have the following expression:
[tex]p(x)=(x-(-2))(x-1)(x-4)[/tex]If we multiply these factors we get:
[tex]\begin{gathered} p(x)=(x+2)(x-1)(x-4) \\ \Rightarrow p(x)=(x^2+x-2)(x-4) \\ \Rightarrow p(x)=x^3-4x^2+x^2-4x-2x+8 \\ p(x)=x^3-3x^2-6x+8 \end{gathered}[/tex]Therefore, the polynomial function with the given zeros is p(x)=x^3-3x^2-6x+8
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