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Why do many problems in mathematics have [two solutions] and have to give up one solution [usually negative one]?
The geometric significance of the solution of the equation lies in the abscissa of the intersection of the function image and the X axis.

Quadratic function image path parabola has 1 or 2 intersections with X axis, and the number of solutions is 1 or 2.

According to the meaning of x in practical problems, it is sometimes necessary to discard a certain value. Negative values are rarely used in life, but they are generally discarded.