12. When should the quadratic formula be used to find the roots of a quadratic equation, ax²+bx+c=0? If the factors of b do not have a sum of a, then the quadratic formula is necessary. If the factors of c do not have a sum of a, then the quadratic formula is necessary. O If the factors of b do not have a sum of c and the value of a is 1, then the quadratic formula is necessary. If the factors of c do not have a sum of b and the value of a is 1, the quadratic formula is necessary. 13. Simplify a√/27 - 2√/3a². C √27-3a² 27-3a² a√3 24a²

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