1. Aug 15, 2008

### XSK

1. The problem statement, all variables and given/known data

the question i have is about part b).

by 'a solution' does it mean what x equals?

as in show that x = -(a x b)/|a|^2 is a solution?

2. Aug 15, 2008

### Alex6200

Well for part A if b is the cross product of a and x, then b is perpendicular to a and x, which would mean that its angle with a is 90. Since the dot product of a and b is equivalent to |a||b|cos($$\vartheta$$), and since cos(90) = 0: the dot product must be 0.

Yes, I think for part B it's saying that that expression is the value of X.