Basic Graphs  Let’s examine the graphs of some common and basic functions 1234 -2 -3 -4 1 2 3 4 -2-3-456 -5 -6 -5-6 5 6 Knowing the graphical representation.

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Presentation transcript:

Basic Graphs  Let’s examine the graphs of some common and basic functions Knowing the graphical representation of basic functions allows us to make alterations or transformations into similar (but more complicated) functions f(x) = x, f(x) = x 2, f(x) = -3 xf(x) = xf(x) = x 2 f(x) =

Basic Graphs f(x) = |x|, f(x) = sqrt(x), f(x) = x 3 Knowing the graphical representation of basic functions allows us to make alterations or transformations into similar (but more complicated) functions xf(x) = |x|f(x) = sqrt(x)f(x) = x 3 -22Not real #-8 1Not real #

Transformations  Now let’s review some basic transformations and their effects  Basically, the question becomes what is being affected by the addition / multiplication of a constant o The x variable (just the independent variable) => horizontal effect o The y variable (or f(x) as a whole) => vertical effect

Vertical Shifts  Vertical shifts (the “y” or entire function is changed by some constant) o The graph of y = f(x) + c is the graph of y = f(x) shifted up vertically by c units o The graph of y = f(x) - c is the graph of y = f(x) shifted down vertically by c units

Horizontal Shifts  Horizontal shifts (the “x” or independent variable is changed by some constant) oThe graph of y = f(x + c) is the graph of y = f(x) shifted to the left (opposite the sign) by c units oThe graph of y = f(x - c) is the graph of y = f(x) shifted to the right (opposite the sign) by c units

Example Graphs f(x) = x - 2, g(x) = x 2 + 1f(x) = (x – 3) 2, g(x) = sqrt(x + 1), h(x) = (x – 3) Vertical Shifts Horizontal Shifts

Reflections Reflections (graph is the same but reflected about the x / y axis) –The graph of y = -f(x) is the graph of y = f(x) reflected about the x-axis (y values are changing) –The graph of y = f(-x) is the graph of y = f(x) reflected about the y-axis (we’re changing the independent variable x)

Stretching / Shrinking Stretching / shrinking (graph is the stretched or shrunk vertically / horizontally) – The graph of y = cf(x) is the graph of y = f(x) vertically stretched (multiplies y- coordinates by c) Think of grabbing the top and bottom of the graph and stretching it – The graph of y = f(cx) is the graph of y = f(x) horizontally stretched (mult. x-coordinates by c)

Example Graphs f(x) = -sqrt(x), g(x) = -x 3, h(x) = sqrt(-x)f(x) = 2sqrt(x), g(x) = sqrt(2x), h(x) = ½x 2 ReflectionsStretching / Shrinking

These basic transformations can be applied to functions (graphs) individually or in combination with one another Look at a couple of HW exercises as an example Book problems: 53,55,59,63,67,69,77,81,83,87,95,100,103,107,109,115 Multiple Transformations