Math help

[Otis Da HousKat]

wtf Thorax, you're 17?

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[Exoyo]

Math excapes my mind.... 0_______________0

I hate math.  I suck at math.  Sorry about me not helping on the math problem..

[Thorax]

wtf Thorax, you're 17?

Yes. Your point?

[Otis Da HousKat]

Yes. Your point?

This is like 7th grade stuff.

[Skip]

This is like 7th grade stuff.

Really? I learned this earlier this year. (9th grade)
Or did I?

[Thorax]

This is like 7th grade stuff.

Exactly. I haven't done it in a while, so I needed a bit of a refresher.

[Daedalus]

This is like 7th grade stuff.

I'm in 7th grade.  
If I'm doing it correctly, it's -48r :|

[Skyler97]

I'm in 7th grade.  
If I'm doing it correctly, it's -48r :|

I'm also in 7th. I think I have the problem figured out too.

[Daedalus]

I'm also in 7th. I think I have the problem figured out too.

What do you think it is?

[Moybus]

4r^-3 x 2r²
(4)(r^-3)(2)(r²)
Collect terms
(4x2)(r^-3xr²)
When multiplying variables with exponents you add the exponents together.
8r^-1
r^-1 is the inverse of r, that is r^-1= 1/r
So
8(1/r)
8/r

I got it right, except I haven't been taught the inverse thing yet.
I'm in 7th grade.

I'm in 7th grade.  
If I'm doing it correctly, it's -48r :|

um no

[Skip]

8/r

It's this. If you can't tell, it's supposed to be a fraction.

[Otis Da HousKat]

Where the hell do people keep getting -48r from? More importantly, why do kids keep trying to  (incorrectly) answer something I already did?

[Thorax]

I feel so old...

Locking.