1/5,1/10,0,_1/10 arthmetic sequence

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.

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