The discriminant of roots is a formula to judge the number of real roots of an equation. Pronunciation of the fourth Greek letter of δ, uppercase δ, lowercase δ. In mathematics or physics, the capitalized δ is used to represent the incremental symbol. And lowercase δ is usually used to represent variables or symbols in higher mathematics.
In the unary quadratic equation ax? +bx+c=0(a≠0):
1, when △ > 0, the equation has two unequal real roots;
2. When △=0, the equation has two equal real roots;
3. When △
In the unary quadratic equation ax? +bx+c=0(a≠0, a, b and c are imaginary numbers):
1, when δ≥ 0, this equation has two equal complex roots;
2. When δ