What affect does the "a" value have on the function f(x) = log(x)?
A. The "a" value reflects the graph across the y-axis.
B. The "a" value moves the function up or down.
C. The "a" value moves the function to the left or right.
D. The "a" value stretches the function vertically by a factor of absolute value of a.

Question

What affect does the "a" value have on the function f(x) = log(x)?
	A.	The "a" value reflects the graph across the y-axis.
	B.	The "a" value moves the function up or down.
	C.	The "a" value moves the function to the left or right.
	D.	The "a" value stretches the function vertically by a factor of absolute value of a.

zepdrix · Answer

I don't see an "a" value in that function.
Do you mean:
f(x) = a log(x) ?

anonymous · Answer

I know, that's what confuses me about this question. A is no where in it. I'm not sure what this means anymore, I figured I'd ask around 'cause I thought I was doing something wrong.

zepdrix · Answer

I would guess they're referring to some general form..
Which is probablyyyyyy something like:$$\Large f(x)\quad=\quad a \log(x-h)+k$$perhaps?

Where $\large h$ represents horizontal shifts, $\large k$ vertical shifts and $\large a$ stretches the function.
$\large a$ will also reflect the function across the `x-axis` if the value is negative.
But NOT across the `y-axis`.

I hope that's the place they wanted to put the $\large a$ at least :) hehe