Since we were asked to plot the – f ( x ) f(x) f ( x ) reflection, is it very important that you recognize this means we are being asked to plot the reflection over the x-axis. Step 1: Know that we're reflecting across the x-axis Below are several images to help you visualize how to solve this problem. Don't pick points where you need to estimate values, as this makes the problem unnecessarily hard. When we say "easy-to-determine points" what this refers to is just points for which you know the x and y values exactly. Remember, the only step we have to do before plotting the − f ( x ) -f(x) − f ( x ) reflection is simply divide the y-coordinates of easy-to-determine points on our graph above by (-1). Given the graph of y = f ( x ) y = f(x) y = f ( x ) as shown, sketch y = − f ( x ) y = -f(x) y = − f ( x ). The best way to practice drawing reflections across the y-axis is to do an example problem: In order to do this, the process is extremely simple: For any function, no matter how complicated it is, simply pick out easy-to-determine coordinates, divide the y-coordinate by (-1), and then re-plot those coordinates. In a potential test question, this can be phrased in many different ways, so make sure you recognize the following terms as just another way of saying "perform a reflection across the x-axis":ġ) Graph y = − f ( x ) y = -f(x) y = − f ( x ) One of the most basic transformations you can make with simple functions is to reflect it across the x-axis or another horizontal axis. Before we get into reflections across the y-axis, make sure you've refreshed your memory on how to do simple vertical and horizontal translations.
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