Lesson Graphing Quadratic Equations (Parabolas) -- Easy as 1-4-9

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This Lesson (Graphing Quadratic Equations (Parabolas) -- Easy as 1-4-9) was created by by MLipsky(9)  : View Source, Show

Graph Parabolas — easy as 1-4-9

Example: Graph
 The vertex is Okay, the vertex is at (1, ?). How do I find the y-coordinate? Plug in x. So, the vertex is at (1, -10).

Now here's a trick you won't find in your math book.

You can graph the rest of the function in less than a minute, using the 1-4-9 method. Here's how:
 From the vertex, move right 1, move up 1a. From the vertex, move right 2, move up 4a. From the vertex, move right 3, move up 9a. Reflect points to the left, & graph parabola.

You can use the 1-4-9 method to graph any quadratic equation. It's fast, it's easy, and it works every time!

Courtesy of Michael Lipsky, experienced teacher and tutor. Algebra, Geometry, Basic Math, and Precalculus In-Person, Online, or by E-mail (954) 560-1646, MathLocker.com

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