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# C4 Solomon paper L q5 watch

1. Can someone help in part C?
I got that the modulus of X should be less than 1 but mark scheme states that it must be less than half. Can anyone explain why?

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2. (Original post by Lilly1234567890)

Can someone help in part C?
I got that the modulus of X should be less than 1 but mark scheme states that it must be less than half. Can anyone explain why?

Posted from TSR Mobile
|2x| < 1
3. (Original post by Lilly1234567890)

Can someone help in part C?
I got that the modulus of X should be less than 1 but mark scheme states that it must be less than half. Can anyone explain why?

Posted from TSR Mobile
because of the term on the bottom of the fraction

I havent done the question so i dont know what the partial fractions are but at some stage you have to expand using the binomial expansion, this is why |x|<0.5
4. (Original post by Lilly1234567890)

Can someone help in part C?
I got that the modulus of X should be less than 1 but mark scheme states that it must be less than half. Can anyone explain why?

Posted from TSR Mobile
In general, the expansion of for non-natural is only valid for .
5. (Original post by Zacken)
In general, the expansion of for non-natural is only valid for .
what if we look at the other expansion 1-x, wont it then be the modulus of x is less than 1
6. (Original post by Lilly1234567890)
what if we look at the other expansion 1-x, wont it then be the modulus of x is less than 1
Yes.
7. (Original post by Lilly1234567890)
what if we look at the other expansion 1-x, wont it then be the modulus of x is less than 1
But you are doing two expansions. You need the range of values for which both are valid, i.e. the smaller range.

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