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Where is the p?

Algebra Level 4

If $x^2 + px + 1$ is a factor of the expression $ax^3 + bx + c$ , then

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a^2 - c^2 = ab

a^2 + c^2 = -ab

a^2 - c^2 = -ab

a^2 + c^2 = ab

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by Vishwak Srinivasan

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