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c4 binomial expansion

hi:h:

Can someone help me understand where I went wrong on part b please, the answer is meant to be 19.22 instead of 1.922 but I don't know why I need to times by 10 here?

All my working out seems to be logical from as far as I can see

Thanks :smile:


@Zacken?:tongue:
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Reply 1
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Zacken
22
Original post by Katiee224
hi:h:

Can someone help me understand where I went wrong on part b please, the answer is meant to be 19.22 instead of 1.922 but I don't know why I need to times by 10 here?

All my working out seems to be logical from as far as I can see

Thanks :smile:


@Zacken?:tongue:


No, when you plug in x=0.1, your approximation is for 7.1^(1/3). Not for 10 * (7.1)^(1/3).

(7100)^(1/3) is given by multiplying your approximation for 7.1^(1/3) by 10.

Remember that 8 - 9(0.1) = 7.1, not 7100.
Reply 2
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Katiee224
OP
11
Original post by Zacken
No, when you plug in x=0.1, your approximation is for 7.1^(1/3). Not for 10 * (7.1)^(1/3).

(7100)^(1/3) is given by multiplying your approximation for 7.1^(1/3) by 10.

Remember that 8 - 9(0.1) = 7.1, not 7100.


ohhhh I get it now thanks hehe :smile:

remind me to buy you a pint when you move to Cambridge :beer:

edit: when I turn 18:tongue:
(edited 7 years ago)
Reply 3
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Zacken
22
Original post by Katiee224
ohhhh I get it now thanks hehe :smile:

remind me to buy you a pint when you move to Cambridge :beer:

edit: when I turn 18:tongue:


I think you mean Warwick. :tongue:

I'm almost 18. :woo:
Reply 4
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Katiee224
OP
11
Original post by Zacken
I think you mean Warwick. :tongue:

I'm almost 18. :woo:


I thought you firmed Cambridge, my bad :colondollar:

Well I live near Warrick and I'd happily buy you a pint to say thanks :tongue:
Reply 5
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Zacken
22
Original post by Katiee224
I thought you firmed Cambridge, my bad :colondollar:

Well I live near Warrick and I'd happily buy you a pint to say thanks :tongue:


I did, but I'm pretty sure I've missed my offer. :tongue:

Sounds fab. That'll be one "pro" for missing my offer and having to go to Warwick. :lol:

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