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.
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The solution of one-dimensional equation may be limited by some practical conditions.
For example, does a function about the application problem of how many parts are produced every day conform to X? -10x-24=0 The roots of this equation: x= 12, x=-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 x=-2 is not the solution of this problem at this time, but can only be said to be the root of the equation.