Rod Calculus - Polynomial Equations of Four Unknowns

Polynomial Equations of Four Unknowns

Mathematician Zhu Shijie further developed rod calculus to include polynomial equations of 2 to four unknowns.

For example, polynomials of three unknowns:

Equation 1:

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Equation 2:

Equation 3:

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After successive elimination of two unknowns, the polynomial equations of three unknowns was reduced to a polynomial equation of one unknown:

Solved x=5;