Ononot — Consider a cubic polynomial P(x) = x^3 + ax^2 + bx + c whose

Polynomialshard

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Consider a cubic polynomial $P(x) = x^3 + ax^2 + bx + c$ whose roots are in arithmetic progression. If the roots are $r-d, r, r+d$ , which of the following expressions must equal $2a^3 - 9ab + 27c$ ?