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November 20, 2014

November 20, 2014

Posted by **de3100** on Thursday, October 17, 2013 at 12:44pm.

k(x + c)

k(x) + c

k(cx)

c • k(x)

- math -
**Steve**, Thursday, October 17, 2013 at 12:45pmshift or scale. Any ideas which go where?

- math -
**de3100**, Thursday, October 17, 2013 at 1:16pmi dont understand it can you

- math -
**Steve**, Thursday, October 17, 2013 at 2:17pmconsider the graph

k(x) = x^2

k(x) = x^2+5 is the same graph, shifted up 5 units.

Similarly, k(x) = (x-5)^2 is the same graph, shifted to the right by 5 units.

If you think of the k-axis moved to the right 5 units, all the new x-coordinates are 5 less than the old ones. That's why substituting (x-5) is the same as moving the k-axis 5 units to the right.

Think of scaling the same way. The graph grows or shrinks because the x-coordinate grows or shrinks by a factor of c.

Visit http://rechneronline.de/function-graphs/ where you can play around with tweaking the functions and see how they are affected. You can display up to 3 graphs at once. So, enter

x^2 for the first,

(x-5)^2 for the 2nd, and

x^2+5 for the 3rd.

You might want to change x and y ranges from -5 to 5 and make them -10 to 10 instead. Just play around some.

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