- #1
msslowlearner
- 33
- 0
Homework Statement
show that:
( a - b ) x (a + b ) = 2a x b
and wat is its geometric interpretation ??
I'm not sure what's wrong, but i somehow got the value as 2a and not wat was required... PLease help.
Homework Equations
Since this is a proof, the answer I've arrived at is wrong. How do I arrive at the solution ?
The Attempt at a Solution
First of all, i took the cross product and tried proving the statement, but couls arrive at it whatsoever. I ended up with a 2a actually.
As for the second part, with the parallelogram idea, i really could not figure out how to find 2a x b. After analysis, I arrived at 2a , but am stuck there . please help.