[mack]

what the hell is up with this inverse function ****!? any body know how to do inverse funstions in their calculator? e.g.

what the inverse of f(x)=1/2x-4, and how do you graph both of them in the ti-83??? wtf, these are dumb. i understand that f(x) means Y... help

as usuall.

 

[mack]

wow, all i can hope for is that he doesnt check the homework tomorrow. yeah, i have class on saturday. arent you jealouse.

 

[COmtbiker12]

Lemme check my math notes, we did that a few chapters back so its not fresh in my head....

 

[COmtbiker12]

Nevermind. Checked them and realized I took poor notes so I dont remember any of the information or how to do it. Sorry.

 

[mack]

ok, thanks for looking though, i think im guna go see him for extra help. hes a ****ing drop out engineer. :angry:

 

[Rip]

Consumption Junction
What's your Function

 

[laura]

math is way overrated. us social scientists dont need math. whats your major?

 

[bodycheck131]

It crosses at (o,-4) on the graph and the line goes up and to the right, I don;t know how to graph that though on a calculator.

 

[downhillzeypher]

Plug the original into the y1 space and the inverse function into the y2. Then hit graph and it'll graph and I believe you wanna find the intersection? Well too bad, I started losing intrest and falling asleep after that...

 

[johnbryanpeters]

f(x)=1/2x-4

1
------
1
-- - 4
2x

2x
------
1 - 8x

2x (1 - 8x)

1/f(x) = 2x - 16x**2

 

[mack]

ok thanks. 10th grade math sucks.... gggrrrrrrr.

 

[Tully]

I just find the inverse of the function and then enter that equation.

Make it y=x, then switch x and y and solve for y.
For example, if f(x)=10x+5, make it y=10x+5, then x=10y+5, and solve for y. In this case, 1/f(x)=(x-5)/10. Do you follow?

Graphically, the inverse is the original function, reflected across the x-axis. good luck with your homework!

 

[mack]

oh i get it. i think thats what my teacher was trying to explain. i dont know why some teachers just suck at teaching. so when i switch it around and solve, that is the equation that i would plug in for Y2= on my calculator?

 

[Tully]

Exactly. Just make it x=...y... and solve for y, and the new equation is the inverse. I don't think the TI-83 has an inverse feature (and even if it does, you don't really need it, anyway).

 

[skeletor]

if u graph the original equasion, you can graph the inverse on paper by just flipping around the x and y coords. so like if u have (3,8) as a point on the original equasion, just graph (8,3) on paper.

 

[Wumpus]

f(x)=1/2x-4 = (2x-4)^ -1

 

[-dustin]

well, if you think that's bad i suggest you get through as much AP math as possible in high school before going to college.

oh, is it (1/2x)-4 or 1/(2x-4)?