You are Here: Home >< Maths

# How is -4 divided by -4 = -8 watch

1. (Original post by abc:))
Lol I'm being destroyed I really need this explaining to me
Easy target and I'm bored tbh

Posted from TSR Mobile
2. (Original post by drandy76)
Technically speaking it is getting smaller if we're only concerned with the magnitudes

Posted from TSR Mobile
But we're not
3. (Original post by Student403)
But we're not
Traitor

Posted from TSR Mobile
4. I think what's happened is the divide sign on your calculator has been rubbed out a bit and now looks like a minus sign.
5. (Original post by tanyapotter)
I think what's happened is the divide sign on your calculator has been rubbed out a bit and now looks like a minus sign.
6. (Original post by Kvothe the arcane)
He still could have typed -4-4 into his calculator.
7. (Original post by NoahMal)
-4/-4 Firstly two negatives cancel out hence its 4/4 which is 1 therefore by mathematical induction it does not equal -8....
This is correct. I agree wholeheartedly.
8. I'm gonna start off by assuming that where k is some constant.

and so we now know that .

From our original equation we have and we know that anything divided by 0 is infinity, and so .

We reject the positive solution because x = -4 in our original example and so it must be negative infinity: .

Infinity is just an rotated 90 or 270 degrees, so and it follows that , hence -4 divided by -4 is indeed -8.
9. (Original post by Ayman!)
I'm gonna start off by assuming that where k is some constant.

and so we now know that .

From our original equation we have and we know that anything divided by 0 is infinity, and so .

We reject the positive solution because x = -4 in our original example and so it must be negative infinity: .

Infinity is just an rotated 90 or 270 degrees, so and it follows that , hence -4 divided by -4 is indeed -8.
Today is a good day in maths history
10. (Original post by Ayman!)
I'm gonna start off by assuming that where k is some constant.

and so we now know that .

From our original equation we have and we know that anything divided by 0 is infinity, and so .

We reject the positive solution because x = -4 in our original example and so it must be negative infinity: .

Infinity is just an rotated 90 or 270 degrees, so and it follows that , hence -4 divided by -4 is indeed -8.
nah you forgot you have to rotate the k by 90 or 270 degrees as well

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: July 18, 2016
Today on TSR

### Edexcel C2 Core Unofficial Markscheme!

Find out how you've done here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams