Thread: Lesson 8-4 Perpendicular Vectors: Cross products

Use the definition of cross products to prove that for any vectors, a, b, c,
a x (b + c) = (a x b) + (a x c)
*the variables have a little arrow on top of them
please show all work for this problem

Originally Posted by Vileblood

Use the definition of cross products to prove that for any vectors, a, b, c, a x (b + c) = (a x b) + (a x c)
please show all work for this problem

Why have you not shown any work whatsoever?

I don't know where to begin with this problem.

Originally Posted by Vileblood

I don't know where to begin with this problem.

Since the instructions say to use the definition of a cross product, I'd start there.

Originally Posted by Vileblood

I don't know where to begin with this problem.

Start with .

Then use the definitions to find .

Then try to unpack it to get .