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# Evaluating, after obtaining a bionomial expansion equation watch

1. Find the first four terms of

By using Bionomial expansion I got - this is correct

Part b. By substituting x=100 find a value for
2. (Original post by Dexter212)
Example: when x=100 how could I find a value of

The equation I have is :

3. (Original post by Notnek)
There.
4. (Original post by Dexter212)
Find the first four terms of

By using Bionomial expansion I got - this is correct

Part b. By substituting x=100 find a value for
If you plug 100 into then that gives you . So plugging 100 into

will give you an approximation for .

But you actually require an approximation for . What can you do to an approximation to to turn it into an approximation to ?
5. (Original post by Notnek)
If you plug 100 into then that gives you . So plugging 100 into

will give you an approximation for .

But you actually require an approximation for . What can you do to an approximation to to turn it into an approximation to ?
Multiply by 10?
6. (Original post by Dexter212)
Multiply by 10?
Correct
7. (Original post by Notnek)
Correct
Thank you.
8. (Original post by Notnek)
Correct
when asked to find the validity of I know this is the same as

there fore I thought the valitidy would be

but it is why?
9. (Original post by Dexter212)
when asked to find the validity of I know this is the same as

there fore I thought the valitidy would be

but it is why?
is the same as . Think about this if you're unsure and let us know if you need an explanation.
10. (Original post by Notnek)
is the same as . Think about this if you're unsure and let us know if you need an explanation.
Im going to need an Explanation.
11. (Original post by Dexter212)
Im going to need an Explanation.
Well what does mean? Are you happy that e.g. which is . Think about and check that any number in this interval will satisfy .
12. (Original post by Notnek)
Well what does mean? Are you happy that e.g. which is . Think about and check that any number in this interval will satisfy .
Oh SNAP!

damn. thank you very much

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