Математика для іноземних громадян Веденєєва О.А.

Quadratic Equation

Only if it can be put in the form ax² + bx + c = 0, and a is not zero.

The name comes from "quad" meaning square, as the variable is squared (in other words x²).

The solution(s) to a quadratic equation can be calculated using the Quadratic Formula:

The "±" means we need to do a plus AND a minus, so there are normally TWO solutions !

The blue part (b² - 4ac) is called the "discriminant", because 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 solution,
• when it is negative we get complex solutions.