Discussion:
Ian George
2007-03-20 14:05:51 UTC
Raw Message
Hi,

This question is probably going to fall into the category of extremely
stupid in this forum, but I am working through a financial course at
the moment, and it is starting to test my less than perfect grasp of
basic algebra, so I am doing a bit of refresher work.

I am trying to evaluate (3^2 .2^2)^2

to which my text is telling me the answer should be 1296, and to my
immense frustration I can't come up with anything remotely resembling

Any chance someone here can point out what I'm missing?

TIA, Ian
John
2007-03-21 00:14:54 UTC
Raw Message
I got realy bad grades in algebra back in middle school 40 years ago and I have
not taken a math class since then - but I can easiely see that the answer is
1296

(9x4)^2 = 1296
Post by Ian George
Hi,
This question is probably going to fall into the category of extremely
stupid in this forum, but I am working through a financial course at
the moment, and it is starting to test my less than perfect grasp of
basic algebra, so I am doing a bit of refresher work.
I am trying to evaluate (3^2 .2^2)^2
to which my text is telling me the answer should be 1296, and to my
immense frustration I can't come up with anything remotely resembling
Any chance someone here can point out what I'm missing?
TIA, Ian
____ _
| __\_\_o____/_|
| o'
Ian George
2007-03-21 00:37:44 UTC
Raw Message
Gee, I knew I'd end up feeling stupid, and still do, because I don't
know why .2 becomes 4 rather than .4? Which is why my answer was
closer to 13 than 1300.. Which rule have I forgotton here?

Cheers, Ian
Post by John
I got realy bad grades in algebra back in middle school 40 years ago and I have
not taken a math class since then - but I can easiely see that the answer is
1296
(9x4)^2 = 1296
Post by Ian George
Hi,
This question is probably going to fall into the category of extremely
stupid in this forum, but I am working through a financial course at
the moment, and it is starting to test my less than perfect grasp of
basic algebra, so I am doing a bit of refresher work.
I am trying to evaluate (3^2 .2^2)^2
to which my text is telling me the answer should be 1296, and to my
immense frustration I can't come up with anything remotely resembling
Any chance someone here can point out what I'm missing?
TIA, Ian
____ _
| __\_\_o____/_|
| o'
Ken Pledger
2007-03-21 21:06:45 UTC
Raw Message
Post by Ian George
Gee, I knew I'd end up feeling stupid, and still do, because I don't
know why .2 becomes 4 rather than .4? Which is why my answer was
closer to 13 than 1300.. Which rule have I forgotton here?
....
Rather than forgetting any rule, you may just have been misled by
bad notation. In algebraic formulae people sometimes insert a dot to
indicate multiplication, for example a.b instead of ab . But IMHO
it's a bad practice to carry over that convention to arithmetical
formulae, as the multiplication dot is easily confused with a decimal
(3^2 x 2^2)^2 . (That last dot was just a fullstop. :-)

Ken Pledger.
Stuart M Newberger
2007-03-23 09:22:24 UTC
Raw Message
Post by Ken Pledger
Post by Ian George
Gee, I knew I'd end up feeling stupid, and still do, because I don't
know why .2 becomes 4 rather than .4? Which is why my answer was
closer to 13 than 1300.. Which rule have I forgotton here?
....
Rather than forgetting any rule, you may just have been misled by
bad notation. In algebraic formulae people sometimes insert a dot to
indicate multiplication, for example a.b instead of ab . But IMHO
it's a bad practice to carry over that convention to arithmetical
formulae, as the multiplication dot is easily confused with a decimal