It is also the French region around the City of Tours and home to many of the great Chateaux of the Loire.
This is a stub: want to fix it?
... 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 ...