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A monic cubic has roots 1, 2 and 3. Its expansion is
Ax^3 - 6x^2 + 11x - 6
Bx^3 + 6x^2 + 11x + 6
Cx^3 - 11x^2 + 6x - 6
Dx^3 - 6x^2 + 6x - 11
Answer & Solution
Correct answer: A. x^3 - 6x^2 + 11x - 6
The sum of roots is 6, the pairwise products add to 11 and the product is 6, giving x^3 - 6x^2 + 11x - 6.
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