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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!

quadrant	quadratic equation	quadratic formula
quadratic polynomial	quadrilateral	quotient

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Quadrant
When working with the Cartesian plane (also called the rectangular coordinate system), a quadrant 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.

quadrants on the Cartesian plane

Quadratic Equation
A quadratic equation is of the form

where a, b and c are numbers.
In this example:
is really
where a = 1, b = -6 and c = 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.
For more info on solving quadratic equations, check out my lessons on Quadratics Solving Overview. Here are the full lessons: Solving Quadratics by Factoring, Solving Quadratics by Using the Square Root, Solving Quadratics with the Quadratic Formula.

Quadratic Formula
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 a = 1, b = -6 and c = 4

For more info and examples on the quadratic formula, check out my Quadratic Formula lesson.
To see where the quadratic formula comes from, check out my animated Proof of the Quadratic Formula.

Quadratic Polynomial
A quadratic polynomial is of the form

The graph of a quadratic polynomial is the parabola.
For more info on quadratic polynomials, check out my Quadratics lessons.

Quadrilateral
A 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.

quadrilateral

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

For more info, check out my Division Lessons.

no
J's

no
X's

no
Y's

no
Z's