2. The common point of two line segments.

3. It´s the line that runs out the center of the parabola, dividing it in two perfect halves.

4. -Concave upward: Slope increases. (It´s positive)

-Concave downward: Slope decreases. (It´s negative)

5. The roots are the "x" intercepts of the graph.

6. We fin roots by setting f(x) = 0. You can find them by using the quadratic formula or factoring.

7.

8. -Math Open Reference (2009) Vertex. Math Open Reference. Retrieved from: http://www.mathopenref.com/vertex.html 

-Wikihow. (2015). How to find the roots of a quadratic equation. Wikihow. Retrieved from: http://www.wikihow.com/Find-the-Roots-of-a-Quadratic-Equation

-Biology Arizona. (2006). Roots of quadratic equations and the quadratic formula. Biology Arizona. Retrieved from: http://www.biology.arizona.edu/DEFAULT.html

-Pérsico, C. (2002) Enciclopedia Interoceánica Tercer Milenio, Uruguay: Interoceánica.

2. The minimum or maximum in a quadratic equation.

3. A line of symmetry for a graph.

4. For a quadratic function f(x)=ax2+bx+c,
if a>0, then f is concave upward everywhere,
if a<0, then f is concave downward everywhere.

5. Roots are also called x-intercepts or zeros. A quadratic function may have one, two, or zero roots.

6. to find the roots of a quadratic function, we set f (x) = 0, and solve the equation: ax² + bx + c = 0.

2. Where two lines segments or rays meet.

3. The vertical line that passes through the vertex 

4. If the graph opens upward, the y-coordinate of the vertex is the minimum (concave up). If the graph opens downward, the y-cordinate of the vertex is the maximum (concave down)

5. They are the x-intercepts or zeros. the quadratic function may have one, two, or zero roots.

6. To find the rots of a quadratic function we set f (x) = 0. Then we solve the equation: ax² + bx + c = 0

7. image.

8. Bilbiography: 

Urban P., Owen J., Martin D., Haese R. Haese S., Bruce M. (2004) Mathematics for the international student  

Free Mathematics Tutorials (2015) What is the Concavity of Quadratic Functions?. Retrieved March 3, 2015, from http://www.analyzemath.com/calculus/aplications/concavityquadratic.html

Math Open Reference (2009). Vertex - Math word definition. Retrieved March 3, 2015 from http://www.mathopenref.com/vertex.html

BioMath (2006) BioMath: Quadratic Functions. Retrieved March 3, 2015 from http://www.biology.arizona.edu/biomath/tutorials/quadratic/roots.html

2. The vertex is the lowest or highest point of a parabola.

3. The axis of symmetry is the vertical line that divides the parabola into two identical halves. It passes through the vertex.

4. The concavity of a function can be determined when working with the form f(x)=ax²+bx+c If a is positive, then f is positive and the graph of f is concave up. If a is negative, then f is negative and the graph of f is concave down.

5. Roots are the x-intercepts or zeros. In a function there can be one, two, or zero roots.

6. To find the roots you only have to set a value for x and then solve the equation: ax^2+bx+c=0

7. (EXAMPLE BELOW)

8. Bibliography:

Hotmath. (2015). Axis of Symmetry of a Parabola. Retrieved from: http://hotmath.com/hotmath_help/topics/axis-of-symmetry-of-a-parabola.html

Analyzemath. (2015). What is the Concavity of Quadratic Functions? Retrieved from: http://www.analyzemath.com/calculus/applications/concavity_quadratic.html

University of Iowa. (2006). Finding the Vertex of a Parabola. Math Matters at Iowa. Retrieved from: http://www.uiowa.edu/~examserv/mathmatters/tutorial_quiz/geometry/findingvertexofparabola.html

Quadratic Functions. (2015). Quadratic Functions. Retrieved from:http://dl.uncw.edu/digilib/mathematics/algebra/mat111hb/pandr/quadratic/quadratic.html

Pérsico, C (2002) Enciclopedia Interoceánica Tercer Milenio. Uruguay.