STANDARD 21 & 22:
GRAPHING QUADRATIC EQUATIONS
Vocabulary
Parabola: The u-shape of a graph (up if a is positive, down if a is negative)
Axis of Symmetry: The vertical line (x = #) that splits the parabola in half. The equation is x = -b/2a
Vertex: The point (x, y) where the parabola originates. To find it: (-b/2a, substitute x into equation and solve for y-value)
Maximum/Minimum: The highest or lowest point on a parabola. The y-value of the vertex.
Roots/Zeros/x-intercepts/solutions: Visually, where the graph crosses the x-axis. There can be 2 roots, 1 root or 2 imaginary roots.
Axis of Symmetry: The vertical line (x = #) that splits the parabola in half. The equation is x = -b/2a
Vertex: The point (x, y) where the parabola originates. To find it: (-b/2a, substitute x into equation and solve for y-value)
Maximum/Minimum: The highest or lowest point on a parabola. The y-value of the vertex.
Roots/Zeros/x-intercepts/solutions: Visually, where the graph crosses the x-axis. There can be 2 roots, 1 root or 2 imaginary roots.
How to Graph a Quadratic
How to:
1. Determine if graph opens up or down
2. Find the axis of symmetry and sketch it in (x = /b/2a)
3. Find the vertex (-b/2a, substitute x-value into equation and solve)
4. It may also be helpful to solve and find the roots (using a method from previous page)
5. Sketch it all out!
Watch this video: http://www.virtualnerd.com/algebra-2/quadratics/graphing-example.php
1. Determine if graph opens up or down
2. Find the axis of symmetry and sketch it in (x = /b/2a)
3. Find the vertex (-b/2a, substitute x-value into equation and solve)
4. It may also be helpful to solve and find the roots (using a method from previous page)
5. Sketch it all out!
Watch this video: http://www.virtualnerd.com/algebra-2/quadratics/graphing-example.php
Try the quadratic equation explorer!http://www.mathsisfun.com/algebra/quadratic-equation-graph.html
Ready to start moving into Algebra 2? check out this video describing the different forms of a quadratic function:http://www.virtualnerd.com/algebra-2/quadratics/graph-intercept-form.php
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File Size: | 46 kb |
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Complete All | |
File Size: | 60 kb |
File Type: | png |