It is descended from Old English wé, which was pronounced something like way in modern English. It is related to German wir, Dutch wij, Frisian wy, and Danish vi.
See also:
... 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 ...