History of Hindu Mathematics: A Source Book v2.c17.s8.4

v2.c17.s8.4

The geometrical solution of the simple quadratic equation $4b² - 4dh = - c²$ is found in the early canonical works of the Jainas (500-300 B. C.) and also in the *Tattvârthâdhigama-sûtra* of Umâsvâti (*c.* 150 B. C.),¹ as $h = ½(d - √(d² - c²)).$