Question: Which of the following is the standard form of a quadratic equation?

Options:

1. ax^2 + bx + c = 0
2. y = mx + b
3. ax + b = c
4. x^2 + y^2 = r^2

Correct Answer: ax^2 + bx + c = 0

Solution:

The standard form of a quadratic equation is ax^2 + bx + c = 0, where a, b, and c are constants.