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# C1 Maths - Inequalities Watch

2. (Original post by lizz-ie)
If the critical values are a and b then

The inside region is a<x<b

The outside region is x<a or x>b
3. (Original post by TenOfThem)
If the critical values are a and b then

The inside region is a<x<b

The outside region is x<a or x>b
But how do you know which one to use?
4. (Original post by TenOfThem)
If the critical values are a and b then

The inside region is a<x<b

The outside region is x<a or x>b
Not if b < a.

5. (Original post by lizz-ie)
But how do you know which one to use?
There are a number of ways

I simply pick a number and if it is good that tells me all of that section is good

Others (mr.m) will sketch a graph
6. (Original post by lizz-ie)
These amazing videos helped me with the inequalities stuff
http://www.examsolutions.net/maths-r.../C1/module.php

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