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The graph of y = f(x) is shown below. Assume the domain of f is [-4,4] and that the vertical spacing of grid lines is the same as the horizontal spacing of grid lines. 

size(150);real ticklen=3;real tickspace=2;real ticklength=0.1cm;real axisarrowsize=0.14cm;pen axispen=black+1.3bp;real vector...

Part (a): The points (a,4) and (b,-4) are on the graph of y = f\left( 2x \right). Find a and b. 

Part (b): Find the graph of y = f\left( 2x \right). Verify that your points from part (a) are on the graph. 

Part (c): The points (c,4) and (d,-4) are on the graph of y = f\left( 2x - 8 \right). Find c and d. 

Part (d): Find the graph of y = f\left( 2x - 8 \right). Be sure to verify that your points from part (c) are on the graph both algebraically and geometrically. 

 

hints: 

Note that  f(2x-8) = f(2(x-4)).
Let  g(x) = f(2x) and  h(x) = g(x-4).
 Nov 23, 2014

Best Answer 

 #3
avatar+118703 
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This is the forth or fifth time this has been posted.  It has been answered at least 3 times in full !

I first answered it a few days ago.  I think I even put it in my End of Day Wrap!

Are you losing track of your posts.  

If you become a member they will be stored automatically in your watchlist!!

 Nov 24, 2014
 #1
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Please use graphs in your explanation. and explain thoroughly. Thank you so much!

 Nov 23, 2014
 #2
avatar+23254 
+5

For the graph shown, each box has a width and height of 1.

The graph of f(2x) would be identical to the graph of f(x) if you change the scale on the x-axis, so that the width of each box would be ½ (but keep the height the same as it was).

a)  On the original graph, there is the point (-4, 4). On the graph of f(2x), the coordinates of the point are                    (-2,4), so a = -2.

      On the original graph, there is the point (4, -4). On the graph of f(2x), the coordinates of the point are                    (2, -4), so b = 2. 

b) See the note above part a.

c)  f(2x - 8)  =  f( 2(x - 4) )  This graph makes a horizontal shift of the graph of f(2x) 4 spaces to the right.                    The graph of f(2x - 8), which is f( 2(x - 4) ), is congruent to the graph of f(2x), just move it 4                          spaces to the right.

     Moving (-2,4) four spaces to the right creates (2,4), so c = 2.

     Moving (2,-4) four spaces to the right creates (6, -4), so d = 6.

d)  Draw the graph of f(2x), then move that graph 4 spaces to the right to create f(2x - 8).

 Nov 24, 2014
 #3
avatar+118703 
+5
Best Answer

This is the forth or fifth time this has been posted.  It has been answered at least 3 times in full !

I first answered it a few days ago.  I think I even put it in my End of Day Wrap!

Are you losing track of your posts.  

If you become a member they will be stored automatically in your watchlist!!

Melody Nov 24, 2014

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