addition- multiplication of ordinates

[kurrymuncher]

hey just came across a question in tssm 07 or 08, cant remember.  But it had 2 graphs without any equations given and asked you to sketch
f(x) *g(x). How do you do that? i multiplied each y coordiante but it was still wrong.

Its very last minute, sorry 

[BiG DaN]

hey just came across a question in tssm 07 or 08, cant remember.  But it had 2 graphs without any equations given and asked you to sketch
f(x) *g(x). How do you do that? i multiplied each y coordiante but it was still wrong.

Its very last minute, sorry 

i just did this exam
u just multiply the y co-ordinates
make sure to use the negatives aswell tho

[danieltennis]

hey just came across a question in tssm 07 or 08, cant remember.  But it had 2 graphs without any equations given and asked you to sketch
f(x) *g(x). How do you do that? i multiplied each y coordiante but it was still wrong.

Its very last minute, sorry 

Which exam and what question?

[Lulu]

http://vcenotes.com/forum/index.php/topic,7142.0.html

Is it this one? Mao explained it pretty well (I tried but failed I think!)

[kurrymuncher]

yes it is,

i forgot that the graphs had equations.

thanks lulu

[dekoyl]

I'm pretty sure you just multiply the y-values.

But I have a similar question..

How do you know the shape if it gives you f(x) and g(x) and tells you to do f(g(x))? Note that it doesnt result something easy like a quadratic.
I know how to do it with calculator but I think I've seen this on a Exam 1.. not too sure (mind playing tricks.)

[kurrymuncher]

one more question-

Would they put transformations of matrices on exam 1, like finding x' and y' and all the dilations.

[/0]

I'm pretty sure you just multiply the y-values.

But I have a similar question..

How do you know the shape if it gives you f(x) and g(x) and tells you to do f(g(x))? Note that it doesnt result something easy like a quadratic.
I know how to do it with calculator but I think I've seen this on a Exam 1.. not too sure (mind playing tricks.)

Think of f(x) as a 'transformation function'. i.e. applly the appropriate transformations to g(x).

e.g. ,



It's going to be the graph, only square rooted (remember if you take the square root of a number between 0 and 1 it becomes bigger) and translated 1 down.

[dekoyl]

Thank you /0. You understand this so well.
(Sorry can't karma again)