An algebraic expression with three terms is often referred to as a 

A quadratic equation in one variable is an equation of the form 

 is not equal to 0. Learn more about these equations in this video.

What Is a Quadratic Equation in One Variable?

A quadratic equation in one variable is an equation of the form ax² + bx + c = 0, where a is not equal to 0. Learn more about these equations in this video. 

An equation that can be written in the form 

where the coefficient a is not equal to 0

A linear equation in one variable can be written in the form 

The number in front of a variable or product of variables, showing how many you have of that variable or product of variables

A single number or variable, or a number and variables multiplied together