Why is sridhara considered to be a great mathematician?

Sridhara

Sridhara, was an Indian mathematician who lived around the 10^th century (AD 870-930). There  are two theories concerning his birthplace. Some historians believe that sridhara was born in southern india. He is famous for his writings on the practical applications of algebra, and he was one of the first to give a formula for solving quadratic equations.

          Sridhara is known as the author of two mathematical treatises, namely the trisatika, sometimes called the patiganitasara, and the patiganita. However, at least three other works have been attributed to him too. The patiganita covers the mathematical operations of addition, subtraction, multiplication, division, finding squares, cubes and their roots, fractions, proportions, and some geometrical principles, but the last section is lost. The Trisatika is a brief summary of the patiganita.