# Online Math Dictionary: Q

Easy to understand math definitions for K-Algebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!

 QuadrantWhen working with the Cartesian plane (also called the rectangular coordinate system), aquadrant is one of the four different regions on the plane.  They are usually labeled with Roman numerals, starting with I and going counter-clockwise in order.  As you can see on the picture on the right, there are four quadrants on the Cartesian plane.  The quadrants are separated by the x and y axes.

A quadratic equation is of the form

where ab and c are numbers.
In this example:
is really
where = 1= -6 and = 4

It's the x squared term that makes the equation quadratic.  Without that, it would just be a linear equation.  It is an equation since is it set equal to 0.

Given a quadratic equation in the form

The quadratic formula (which I like to call The Quadranator) gives you the values for x.  Here's the formula:

For example, given the quadratic equation

which is  really
where = 1= -6 and = 4

To see where the quadratic formula comes from, check out my animated Proof of the Quadratic Formula.

A quadratic polynomial is of the form

The graph of a quadratic polynomial is the parabola.

 QuadrilateralA quadrilateral is a four sided polygon. For more info and properties of quadrilaterals (squares, rectangles, kites, trapezoids,rhombi and parallelograms), check out my Geometry and Trig Reference Area.

Quotient
In a division problem, the quotient is the answer.   In the problem below, the 2 is the answer.