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Modulus Inequalities Watch

1. Need some help with the following question:

What I did was square both sides so

When I expanded I got

Then I got:

Divided by -8 and rationalised to get

Which means I've messed up somewhere I think. Thanks in advance
2. (Original post by Super199)
...
Check step after .
3. (Original post by lazy_fish)
Check step after .

Right I could have cancelled down to get

Not sure how to get the other solution
4. (Original post by Super199)
Need some help with the following question:

What I did was square both sides so

When I expanded I got

Then I got:

Divided by -8 and rationalised to get

Which means I've messed up somewhere I think. Thanks in advance
Multiplying or dividing an inequality by a negative number reverses the inequality sign
5. (Original post by brianeverit)
Multiplying or dividing an inequality by a negative number reverses the inequality sign
Haha I realised that, I was being daft and never realised that either of those answers are acceptable because they are the same thing. Grr. Thanks! by the way I remember you have C3 notes on MEI can I have those by any chance? (I some how lost the pdf thing)
6. (Original post by Super199)
Haha I realised that, I was being daft and never realised that either of those answers are acceptable because they are the same thing. Grr. Thanks! by the way I remember you have C3 notes on MEI can I have those by any chance? (I some how lost the pdf thing)
Here you are. Hope you find them useful.
Attached Images
7. Notes for C1-C4.pdf (918.2 KB, 41 views)

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