Question

Given u=12i-3j and v=-5i+11j, what is u x v?

Answer 1

117

Explanation:

You want the cross product of vectors u = (12i -3j) and v = (-5i +11j).

Cross product

The cross product of 2-dimensional vectors is a scalar that is effectively the determinant of the matrix of coefficients.

u×v = (12)(11) -(-3)(-5) = 132 -15

u×v = 117

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