September 29, 2011

Hi, this is roxanne and our latest lesson was about stretches and compressions.

y=af(x) stretches vertically a is greater than 1.
y=1/af(x) compresses vertically 1 is greater than a.

For example, f(x)= x3 and 2f(x),

The red one is being times by 2 and x stays the same.








You could graph this by:



y=f(bx) compresses horizontally b is greater than 1

y=f(1/bx) stretches horizontally 1 is greater than b

( "read b values as opposite")

For example, f(x)=x2 and f(1/2x),

The red one is being times by two since the opposite of 1/2 is two. And this time y stays the same.

You could graph this by:

I hope everyone had a good weekend! :) Bye.