# Math Vocabulary

## Parabola

1. a symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side. The path of a projectile under the influence of gravity ideally follows a curve of this shape.

A quadratic equation - involving the second and no higher power of an unknown quantity or variable.

## Vertex

each angular point of a polygon, polyhedron, or other figure.

## Axis of Symmetry

1. The two sides of a graph on either side of the axis of symmetry look like mirror images of each other. Example: This is a graph of the parabola y = x2 – 4x + 2 together with its axis of symmetry x = 2. The axis of symmetry is the red vertical line.

## Maximum/Minimum Value

1. To see whether it is a maximum or a minimum, in this case we can simply look at the graph. f(x) is a parabola, and we can see that the turning point is a minimum. By finding the value of x where the derivative is 0, then, we have discovered that the vertex of the parabola is at (3, −4).

## Term

each of the quantities in a ratio, series, or mathematical expression

## First Difference

1. The first-difference (FD) estimator is an approach used to address the problem of omitted variables in econometrics and statistics with panel data. The estimator is obtained by running a pooled OLS estimation for a regression of on .

## Second Differences

For a sequence defined by a quadratic formula, the second differences will be constant and equal to twice the number of n2 . For example,

## Roots

a number or quantity that when multiplied by itself, typically a specified number of times, gives a specified number or quantity