Alush was one of the places, the last before Rephidim, at which the
Hebrews rested on their way to Sinai (Numbers 33:13, 14). It was
probably situated on the shore of the Red Sea.
... 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 both ...