The △u formula in mathematics is δ = b? -4ac. In mathematics, people often use the triangle symbol "delta" to represent "delta". This Greek letter represents a constantly changing quantity in mathematics, and it is the discriminant of the root of quadratic equation ax2+bx+c=0. Because there is a special relationship between the roots and coefficients of a quadratic equation, the roots can be judged without solving the equation.

Univariate quadratic equation ax? Discrimination of Roots of +bx+c=0(a≠0)

Univariate quadratic equation ax? There are three kinds of roots of +bx+c=0(a≠0): there are two equal real roots, two unequal real roots and no real roots. The general form of unary quadratic equation is ax? +bx+c=0, then δ = b? -4ac. If δ > 0, the unary quadratic equation has two unequal real roots; If δ = 0, a quadratic equation with one variable has two equal real roots; If δ < 0, the quadratic equation of one variable has no real root.