Effects of "a"

When the a-value is greater than one, the parabola becomes narrower. When the a-value is less than one, the parabola becomes wider. When the a-value is positive, the parabola will open upward; when it is negative the parabola will open downward.
Example
The graph below represents the function Effects1-1in blue and Effects1-2 in red. Since both a -values are positive, the parabolas open up. Since 5 > 2, the blue parabola will be narrower than the red parabola.

Effects1-3

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