The expression

It can "discriminate" between the possible types of answer:

• when it is positive, we get two Real solutions

• when it is zero we get just ONE real solution (both answers are the same)

• when it is negative we get a pair of Complex solutions

**b**used when solving Quadratic Equations.^{2}− 4acIt can "discriminate" between the possible types of answer:

• when it is positive, we get two Real solutions

• when it is zero we get just ONE real solution (both answers are the same)

• when it is negative we get a pair of Complex solutions

See: Quadratic Equation

Copyright © 2018 MathsIsFun.com