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Parabolas

Grade 9 & 10 math tutorial on quadratic equations & parabolas for SAT, Math Kangaroo, and AMC10 Preparation.




Write equations of parabolas in vertex form

Last modified on 2016-01-12


The equation of a parabola in vertex form has one of the following 2 forms:

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If the parabola is a vertical parabola, it will take the vertical form of the equation, and if the parabola is a horizontal parabola, it will take the horizontal form of the equation.  More...


4852 views 5530


Find the axis of symmetry of a parabola

Last modified on 2015-12-03


The graph of a quadratic function y = ax2 + bx + c is called a parabola. The following graphs are two typical parabolas:

For the sake of explanation, we mark their x-intercepts by red dots, their y-intercepts by a pink dot, and the vertex of each parabola by a green dot:  More...


8410 views 4131


Find the vertex of a parabola

Last modified on 2015-12-03


The graph of a quadratic function y = ax2 + bx + c is called a parabola. The following graphs are two typical parabolas:

For the sake of explanation, we mark their x-intercepts by red dots, their y-intercepts by a pink dot, and the vertex of each parabola by a green dot:  More...


11922 views 6341


Identify the direction a parabola opens

Last modified on 2015-12-03


The graph of a quadratic function y = ax2 + bx + c is called a parabola. The following graphs are two typical parabolas:

For the sake of explanation, we mark their x-intercepts by red dots, their y-intercepts by a pink dot, and the vertex of each parabola by a green dot:  More...


4416 views 5268