Friday

October 31, 2014

October 31, 2014

Posted by **Chris** on Sunday, September 20, 2009 at 5:24pm.

The parent function is x^3

and the problem is:

y=-(0.8x)^3

I know its a reflection over the x-axis, but what is the formula for how much it expands or shrinks?

Like on another problem it's

y=|x|

and y= |0.2x|

The answer is that it expands by 5, but I'm not exactly sure how to get it.

Thanks.

- pre-calculus -
**MathMate**, Sunday, September 20, 2009 at 5:37pm-(0.8x)^3 is stretching in the x-axis by a factor of (1/0.8) and as you noted, a reflection about the x-axis.

When ever the function f(x) is mapped to another by f(kx), it is stretching or contracting by a factor of (1/k). (1/k)>1 is a stretching, and (1/k)<1 is contracting.

- pre-calculus -more -
**MathMate**, Sunday, September 20, 2009 at 5:39pmThe stretching factor (1/k) applies to the x-direction only.

**Answer this Question**

**Related Questions**

precalculus - State the parent function that must be transformed to create the ...

Precalculus - Can someone help me with this question? I got the transformation ...

Adv. Math. - Describe how the graph of y= abs(x-2) is related to the parent ...

Integrated Math 1 - A parent function generates a family of functions that are ...

please help! :( math! - A parent function generates a family of functions that ...

precalculus - is solving this possible graph each function with its parent graph...

Algebra - Describe the transformation of y=5(x-1)^2 from the parent function (y=...

trig - how to graph thr trig function f(x)3x-180)+2 and the parent function?

pre-calculus - Beginning with the graph of y=e^x, describe each of the ...

High School Pre Calculus - This is probably really easy but I am confused. #1 ...