Graphical Transformations
With practice, you will use the ideas from Section 1.6 to construct by hand graphical representations of more complicated function from the 12 Basic Functions. This will help you get rough sketches by hand of things like:
as a transformation of
using shift up of 17 units followed by shift to right of 2 units.
y=2/(x+3) as a trasnformation of y=1/x using a shift left of 3 units followed by a vertical stretch of 2 units.
I am using a computer to get the plots, but ultimately you would be doing this by hand.
First Example: Absolute Value Basic Function
Original Function
In[76]:=
Out[77]=
Vertical Shift
In[78]:=
Out[79]=
Horizontal Shift
In[80]:=
Out[81]=
Vertical Stretch
In[82]:=
Out[83]=
Horizontal Compression
In[84]:=
Out[85]=
Reflection about x-axis
In[86]:=
Out[87]=
Reflection about y-axis
In[88]:=
Out[89]=
Second Example: Cubing Basic Function
Original Function
In[90]:=
Out[91]=
Vertical Shift
In[92]:=
Out[93]=
Horizontal Shift
In[94]:=
Out[95]=
Vertical Stretch
In[96]:=
Out[97]=
Horizontal Compression
In[98]:=
Out[99]=
Reflection about x-axis
In[100]:=
Out[101]=
Reflection about y-axis
In[102]:=
Out[103]=
Third Example: Inverse Basic Function
Original Function
In[123]:=
Out[124]=
Vertical Shift
In[125]:=
Out[126]=
Horizontal Shift
In[127]:=
Out[128]=
Vertical Stretch
In[129]:=
Out[130]=
Horizontal Compression
In[131]:=
Out[132]=
Reflection about x-axis
In[133]:=
Out[134]=
Reflection about y-axis
In[135]:=
Out[136]=
Fourth Example: Combining multiple transformations
Original Function
In[143]:=
Out[144]=
Vertical Shift of 3 units up
In[153]:=
Out[154]=
Vertical Shift of 3 units up followed by
Horizontal Shift of 2 units to the left
In[155]:=
Out[156]=
Vertical Shift of 3 units up followed by
Horizontal Shift of 2 units to the left followed by
Reflection about x axis
In[167]:=
Out[168]=
The Algebraic representation of the final function
In[169]:=
Out[169]=
In[170]:=
Out[170]=
Fifth Example: Combining multiple transformations for
:
shift to right 5 units, then
compress horizontally by 3 units, then
reflect about y-axis.
Original Function
In[175]:=
Out[176]=
Shift 5 units to right
In[177]:=
Out[178]=
then Compress horizontally by 3 units
In[181]:=
Out[182]=
then reflect about the y-axis
In[185]:=
Out[186]=
The algebraic representation of the final function is
In[209]:=
Out[209]=
Sixth Example: Combining multiple transformations for f(x)=1/x to sketch y = 5/(x + 3)
Original Function
In[187]:=
Out[188]=
The algebraic representation of the final function is
In[208]:=
Out[208]=
Shift 3 units to right
In[200]:=
Out[201]=
then vertical stretch of 5 units
In[206]:=
Out[207]=