The polynomial has and as factors

MATHEMATICS · Subjective · CBSE · Mathematics · Polynomials · Polynomials

Problem

The polynomial h(x)=x4−4x3−x2+16x−12h(x)=x^{4}-4x^{3}-x^{2}+16x-12 has (x−1)(x-1) and (x+2)(x+2) as factors. Factorise h(x)h(x) completely and state all its zeros.

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