Algebra II Honors Homework Help

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darshanpatel
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The inverse of f(x)= k(-x^3 -4x -9) is a function and f^-1(7)=1. What is the value of k?


Work is a picture: http://tinypic.com/view.php?pic=29xj4i8&s=5


Mod note: Too large picture deleted


Final Answer: k= (4y+10)/-7
 
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darshanpatel said:
The inverse of f(x)= k(-x^3 -4x -9) is a function and f^-1(7)=1. What is the value of k?


Work is a picture: http://tinypic.com/view.php?pic=29xj4i8&s=5
...

Final Answer: k= (4y+10)/-7
Hello darshanpatel. Welcome to PF.

What is y ?? (Your answer makes no sense.)

Here's a hint: If [itex]\displaystyle f^{-1}(7)=1\,,[/itex] then what is [itex]\displaystyle f(1)\,?[/itex]

Note: When a moderator of these forums sees the size of that image, he/she will likely delete it.
 
The y is from exchanging the x and y's to get the inverse, also can you please help me and not hint lol.
 
darshanpatel said:
The y is from exchanging the x and y's to get the inverse, also can you please help me and not hint lol.

LOL indeed!

Read the rules of these Forums.

By the way: The hint I gave should lead you directly to the solution.
 
There is a template that should be used for homework. Next time, please fill it out instead uf uploading a picture.

Picture copied.
 

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SammyS said:
LOL indeed!

Read the rules of these Forums.

By the way: The hint I gave should lead you directly to the solution.

I don't understand the hint... Do I plug it directly in or something?

Evo said:
There is a template that should be used for homework. Next time, please fill it out instead uf uploading a picture.

Picture copied.

Also Another PF mod or something said it was ok...
 
So I plug 1 into x variables and make whole equation = to 7?
 
Thank you, you are really smart. :)
 
darshanpatel said:
Also Another PF mod or something said it was ok...
If it is much larger than 800 x 600 pixels, the moderators will likely delete it.