Question about C4 binomial expansion?

I know how to do these types of questions, however I always make some kind of silly mistake. I have my exam tomorrow and I just wanted to ask whether any of you know if there is any way of checking whether my answer is correct. For example can I put in a value for x or something like that. I have attached an example of a question so u know what I'm talking about.

Reply 1

TenOfThem

18

Original post by lorobolorolo

I know how to do these types of questions, however I always make some kind of silly mistake. I have my exam tomorrow and I just wanted to ask whether any of you know if there is any way of checking whether my answer is correct. For example can I put in a value for x or something like that. I have attached an example of a question so u know what I'm talking about.

The short answer is no

Using a value might occasionally work but not generally -just take care :s-smilie:

Reply 2

lorobolorolo

OP

7

Original post by TenOfThem

The short answer is no

Using a value might occasionally work but not generally -just take care :s-smilie:

Ahh that's really annoying, but thanks for letting me know

Reply 3

Smaug123

15

Original post by lorobolorolo

I know how to do these types of questions, however I always make some kind of silly mistake. I have my exam tomorrow and I just wanted to ask whether any of you know if there is any way of checking whether my answer is correct. For example can I put in a value for x or something like that. I have attached an example of a question so u know what I'm talking about.

You can sometimes check whether your solution is possible - for instance, if the original function was an odd/even function of x, your answer should have no even powers/odd powers of x. Substituting x=0 is a very quick check (which is by no means guaranteed). In rare cases, it might be easier to find the series of the differentiated/integrated function, then integrate/differentiate the resulting power series. (Remember that if you ever integrate, you need to find the value of the constant term, by substituting.)

Question about C4 binomial expansion?

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