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.

Delta is the pronunciation of the fourth Greek letter, capitalized as δ and lowercase as 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.

"δ" represents the discriminant of the unary quadratic equation ax2+bx+c=0 about the root of X, and the symbol is "δ".

Only depends on the coefficients of a quadratic equation: △=b2-4ac.

The value of △ determines the root of the unary quadratic equation;

When (1) △ > 0, the equation has two unequal real roots.

(2) When △ = 0, the equation has two equal real roots. At this time, ax2+bx+c is completely flat.

(3) When △ < 0, the equation has no real root.