calculus problem is u = 7i +9j + 2 k and v = -7i -9j - 2 k. and my ans is -135 how to double check

5 answers

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Why do you write asu for the subject? Are you going to Arizona State U?

The DOT product of those two vectors, u*v, would be +28, a scalar. The CROSS product u x v would be a vector. You have not said what the question is. You have only defined two vectors.
I get -134 for the dot product.
Damon is correct. I missed a dangling - sign in front of a 9 in the v vector.
my name is sohaib