# Question...

• Jun 24th 2010, 07:17 AM
edendeli
Question...
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 AM
Ackbeet
The meaning of the $\otimes$ 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 AM
edendeli
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 AM
Ackbeet
Try going from the inside out. What is $4\otimes 3$?
• Jun 24th 2010, 09:28 AM
edendeli
i thought ( 4O3)2 = a and 2 = b , then 3ab-2b(sqrt)= b(3a-2b) = > 2(3x12-2x2)= 60 .... :(
• Jun 24th 2010, 09:31 AM
Ackbeet
No, I think you're off a bit. Let me re-define the problem a little. Suppose I define a function as follows:

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

What is $f(4,3)$?
• Jun 24th 2010, 10:59 AM
edendeli
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 AM
Ackbeet
You got it. Just change the notation to use the original symbol, and you're done.
• Jun 24th 2010, 11:25 AM
edendeli
thats great
• Jun 24th 2010, 11:27 AM
Ackbeet
You're welcome. Have a good one!