Algebra II: Graphing the equation of a parabola
 This is a free lesson from our course in Algebra II This lesson covers important basics of a parabola like roots, axis of symmetry etc. Further you'll learn how to identify the key elements and graph the parabola. You will find some examples with solution, and the instructor explains all that with the help of audio, video presentation and in own hand writing. The points where the graph crosses the x-axis are called the roots of parabola and axis of symmetry is a vertical line passing through the turning point of the parabola. You should remember: In case of parabolas of the form: y = ax2 + bx + c, � if a is positive, the parabola opens upward and has a minimum point. � if a is negative, the parabola opens downward and has a maximum point. � the axis of symmetry is x = (-b)/2a. (More text below video...)
Other useful lessons:
 Completing the square Graphing the equation of a circle Graphing the equation of a hyperbola Calculating the asymptotes Conic sections and special points
(Continued from above)The points where the graph of parabola crosses the x-axis are called the roots of parabola and axis of symmetry is a vertical line passing through the turning point of the parabola i.e. through vertex. The standard form of parabola is: y2=4ax. The simple way of graphing parabolas is to prepare a chart based on its equation and variable interval. Then from the graph you can determine roots, vertex. For example, if the equation of parabola is x 2 + 4x � 21, the roots of this equation are (-7, 3) and vertex is      (-2,-25). Winpossible's online math courses and tutorials have gained rapidly popularity since their launch in 2008. Over 100,000 students have benefited from Winpossible's courses... these courses in conjunction with free unlimited homework help serve as a very effective math-tutor for our students.
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