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There is a formula in junior high school mathematics, some of which have δ. How to find x in that formula?
This is the formula for finding the root of a quadratic equation with one variable:

X 1=-b+ radical B2-4ac/2a;

X2=-b- radical b 2-4ac/2a.

Where you say △ is the discriminant of the root of a quadratic equation with one variable: △ = b 2-4ac.