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Explanation & Answer
AS zeroes of polynomial are:
2, 4+√5, 4-√5
The polynomial is
f(x)=(x-2)(x-4-√5)(x-4+√5)=0
f(x)=(x+2)[(x-4)2+√52]
f(x)=(x+2)(x2-8x+21)
f(x)=x3-6x2+13x+42
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