Graphing Standard Function & Transformations
Graphing Standard Function & Transformations
A few standard graphs
f(x) = x
f(x) = 1 x
f(x) = x2 f(x) = x1/2
f(x) = x3
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f(x) =x
Graphing Standard Function & Transformations
The rules below take these standard plots and shift them horizontally/ vertically
Vertical Shifts Let f be the function and c a positive real number.
The graph of y = f(x) + c is the graph of y = f(x) shifted c units vertically upwards.
The graph of y = f(x) - c is the graph of y = f(x) shifted c units vertically downwards.
g(x) = x2 + 2 = f(x) + 2
h(x) = x2 ? 3 = f(x) ? 3
Look for the positive and negative sign. Positive sign makes the graph move upwards and the negative sign makes it move downwards
Here is a picture of the graph of g(x) = x2 1. It is obtained from the graph of f(x) = x2 by shifting it down 1 unit.
Created by UASP Student Success Centers success.asu.edu | 480-965-9072
Graphing Standard Function & Transformations
Horizontal Shifts Let f be a function and c a positive real number. ? The graph of y = f (x + c) is the graph of y = f (x) shifted to the left c units. ? The graph of y = f (x + c) is the graph of y = f (x) shifted to the right c units. g(x) = (x-3)2 = f (x-3) h (x) = (x + 2)2 = f (x+2) Here is a picture of the graph of g(x) = |x4|. It is obtained from the graph of f(x) = |x| by shifting it to the right 4 units.
Horizontal/ Vertical Scaling Horizontal Scaling Let g(x) = f(cx) where c is a positive real number.
Created by UASP Student Success Centers success.asu.edu | 480-965-9072
Graphing Standard Function & Transformations
? If c > graph of f, direction by a
? If 0 < c stretched in the of 1/c
Here is a g(x) = (0.5x)3. graph is f(x) = x3 by direction by a factor of 1/c = 2.
1, the graph of g is the compressed in the xfactor of c. < 1, then the graph is x-direction by a factor
picture of the graph of Since c = 0.5 < 1, the obtained from that of stretching it in the x-
Vertical Scaling Let g(x) = cf(x) here c is a positive real number.
? If c > 1, the graph of g is the graph of f, stretched in the y-direction by a factor of c.
Created by UASP Student Success Centers success.asu.edu | 480-965-9072
Graphing Standard Function & Transformations
? If 0 < c < 1, then the graph is compressed in the y-direction by a factor of 1/c. Here is a picture of the graph of g(x) = 3(x)1/2. Since c = 3 > 1, the graph is obtained from that of f(x) = x1/2 by stretching it in the y-direction by a factor of c = 3.
Reflection about the x axis The graph of y = - f (x) is the graph of y = f (x) reflected about the x- axis. Here is a picture of the graph of g(x) = (x 2 1). It is obtained from the graph of f(x) = x 2 1 by reflecting it in the x-axis.
Created by UASP Student Success Centers success.asu.edu | 480-965-9072
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