Using mathematical language to describe the process of roots of quadratic equation AX ^ 2 + BX + C = 0 A x^2+4x+3=0 B x^2-4x+3=0 C x^2+8x+9=0 D x^2-8x+9=0

Using mathematical language to describe the process of roots of quadratic equation AX ^ 2 + BX + C = 0 A x^2+4x+3=0 B x^2-4x+3=0 C x^2+8x+9=0 D x^2-8x+9=0

Quadratic equation AX ^ 2 + BX + C = 0
Because it is a quadratic equation of one variable, a is not equal to 0
The discriminant of the root of quadratic equation with one variable is △ = B ^ 2-4ac
If △ > 0, the equation has two different real number solutions, x = (- B + √ △) / 2A or x = (- B - √ △) / 2A
Δ = 0 means that the equation has two equal real number solutions, x = (- B + √Δ) / 2A
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