Pronunciation: Delta calculation: △ = b 2-4 * a * c (A, B and C are the coefficients of the quadratic term, linear term and constant term of the equation respectively) Role: Examples of judging the existence of real roots in a quadratic equation with one variable: 1, x2+2x+3 = 0 △ = 2 2-. 0 equation has no real root 2, x2+2x+1= 0 △ = 2 2-4 *1*1= 0 equation has two equal real roots 3, x2+2x-1= 0 △ = 2 2-. The 0 equation has two unequal real roots.

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