Jyesthadeva was the first mathematician to develop the concept of a variable, which is a symbol that can represent any number. This concept was essential for the development of algebra as a field of study.

The Bijaganita is an algebraic treatise that was written by Jyesthadeva in the 16th century. The treatise covers a wide range of topics, including the concept of a variable, the concept of a negative number, and the concept of a zero.

The Bijaganita is an algebraic treatise that covers a wide range of topics, including the concept of a variable, the concept of a negative number, and the concept of a zero.

Jyesthadeva developed the completing the square method for solving quadratic equations. This method involves adding and subtracting a constant term to the equation in order to make it a perfect square.

Jyesthadeva developed the Cardano method for solving cubic equations. This method involves a series of algebraic steps that can be used to find the roots of a cubic equation.

Jyesthadeva developed the Ferrari method for solving quartic equations. This method involves a series of algebraic steps that can be used to find the roots of a quartic equation.

Jyesthadeva did not develop a method for solving quintic equations.

Jyesthadeva proved the Brahmagupta-Bhaskara theorem, which states that the sum of two squares can be expressed as the difference of two squares.

Jyesthadeva proved the Vieta's formulas, which express the coefficients of a polynomial in terms of its roots.

Jyesthadeva proved the Descartes' rule of signs, which states that the number of positive roots of a polynomial is equal to the number of sign changes in the coefficients of the polynomial.

Jyesthadeva developed the Horner's method for finding the roots of a polynomial. This method involves a series of algebraic steps that can be used to find the roots of a polynomial.

Jyesthadeva developed the Gaussian elimination method for solving systems of linear equations. This method involves a series of algebraic steps that can be used to find the solution to a system of linear equations.

Jyesthadeva developed the Newton-Raphson method for solving systems of nonlinear equations. This method involves a series of algebraic steps that can be used to find the solution to a system of nonlinear equations.

Jyesthadeva developed a formula for finding the area of a triangle, which is known as Jyesthadeva's formula.

Jyesthadeva developed a formula for finding the volume of a pyramid, which is known as Jyesthadeva's formula.