heya all .. again...

i was wondering if anyone out there knows the meaning of that symbol x inserted in a O, and if u can help me find the right asnwear on that one ?

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- Jun 24th 2010, 07:17 AMedendeliQuestion...
heya all .. again...

i was wondering if anyone out there knows the meaning of that symbol x inserted in a O, and if u can help me find the right asnwear on that one ? - Jun 24th 2010, 07:20 AMAckbeet
The meaning of the $\displaystyle \otimes$ is defined for you right there in the problem. It's basically a new abstract binary operator. You could also think of it as a function with two arguments: the number on its left, and the number on its right. Does that help?

- Jun 24th 2010, 08:50 AMedendeli
Thanks very much for your help , i still dont fully get it though , , because after that i keep getting different answears from the one who is supposed to me the right one ( which is 100 ) , ill try harder , thanks again

- Jun 24th 2010, 08:52 AMAckbeet
Try going from the inside out. What is $\displaystyle 4\otimes 3$?

- Jun 24th 2010, 09:28 AMedendeli
i thought ( 4O3)2 = a and 2 = b , then 3ab-2b(sqrt)= b(3a-2b) = > 2(3x12-2x2)= 60 .... :(

- Jun 24th 2010, 09:31 AMAckbeet
No, I think you're off a bit. Let me re-define the problem a little. Suppose I define a function as follows:

$\displaystyle f(x,y)=3xy-2y^{2}$.

What is $\displaystyle f(4,3)$? - Jun 24th 2010, 10:59 AMedendeli
you are very good , thanks very much again , i was completely lost :) , have to do a test that includes few models - maths , history , etc and i just got totally mixed up with everything ... ,

is that the right thing to do

f(4,3)=36-18=18

f(18,2)=3x18x2-2x4=108-8=100 ? - Jun 24th 2010, 11:03 AMAckbeet
You got it. Just change the notation to use the original symbol, and you're done.

- Jun 24th 2010, 11:25 AMedendeli
thats great

- Jun 24th 2010, 11:27 AMAckbeet
You're welcome. Have a good one!