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All Hallows

All Hallows is the feast of All Saints in the Christian calendar, observed on November 1. It is one of the cross-quarter days (see quarter days).

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Quadratic formula

... the common denominator is 4a2. We get <math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math> Taking square roots of ...