Many settlements of the Indus Valley Civilisation have been found along the Ghaggar and Hakra rivers. The rivers are often identified as the Vedic Saraswati River.
... getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; it is the square of (x + ...