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# Binomial series expansion help? watch

1. Have I done this series expansion correctly, if so how do I get to the final answer from there as I'm not sure what else I have to do
2. (Original post by Samii123)

Have I done this series expansion correctly, if so how do I get to the final answer from there as I'm not sure what else I have to do
Your final term should be . Note the minus sign. Rest are OK, although:

Problem comes from your powers of "x". They should be . Again the minus sign.

To find what value must x take so that 4-x = 3.9999, and sub into your expansion.
3. (Original post by ghostwalker)
Your final term should be . Note the minus sign. Rest are OK, although:

Problem comes from your powers of "x". They should be . Again the minus sign.

To find what value must x take so that 4-x = 3.9999, and sub into your expansion.
Ahhhhh ok thank you for the help!

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