Because Ferdinand ferdinand verbiest's level of Chinese and Manchu is very limited, he can barely cope with daily conversations. However, when teaching rigorous and profound mathematical knowledge, he could not express it clearly, which made Kangxi difficult to learn and often confused.
When studying equations, Ferdinand ferdinand verbiest taught long sentences with unclear words, and Kangxi had a hard time learning them. How can we make the teacher speak more easily? After careful consideration, Kangxi suggested to the teacher that the unknowns should be translated by "yuan", the highest number of terms should be translated by "times" (especially the whole equation), and the values of the unknowns with equal left and right sides of the equation should be replaced by "roots" (or "solutions").
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The roots of the equation F(x) refer to all values of x that satisfy F(x)=0. The root and solution of a quadratic equation are different, the root can be multiple, and the solution must be different. If a quadratic equation has two different roots, it is also called two different solutions.
The solution of the one-dimensional equation may be limited by some practical conditions, such as: is a function of the application problem about how many parts are produced every day satisfied? -10x-24=0 The roots of this equation: x= 12, x2=-2. Although x=-2 satisfies the condition of the root of the equation, considering the practical application, the output of parts cannot be negative, so x2=-2 is not the solution of this problem at this time, only the root of the equation.