Equation refers to an equation with unknown numbers, which represents the equal relationship between two mathematical expressions such as number, function, quantity and operation. The value of the unknown that makes the equation valid is called the solution or root, and the process of finding the solution of the equation is called solving the equation.
Development history
People's research on equations can be traced back to ancient times. About 3600 years ago, the mathematical problems written by ancient Egyptians on papyrus involved equations with unknowns. Around 825 AD, Al-Hua Lazimi, a mathematician in Central Asia, wrote a book "Elimination and Reduction", focusing on the solution of equations, which had a great influence on the later development of mathematics.
China's research on equations also has a long history. China's ancient mathematical work Arithmetic has nine chapters, written from about 200 BC to 50 BC, one of which is named after the equation. The equations mentioned in this chapter are actually the linear equations now, which are composed of several equations, and its solution is the common solution of these equations.