If v1 = (2,4) and v2 = (-1,5), then v1 * v2 is equal to which of the following?
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I am confused on whether or not I put my answer in parentheses or not. So it would be either B or D.
D. (-2,20)* >.>
Would we leave them in the parentese or add the vectors together?
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Cross product of verctors, right?
It doesn't specify but that's what I am assuming.
Have they given you a figure or something?
Nope, just coordinates.
pretty sure then want dot product because none of those is cross
Here's what I found. I think the answer would be 18...
There is yet another operation associated with vectors. Given two vectors v1 = (x1,y1) and v2 = (x2,y2), the dot product of v1 and v2, written , is the scalar:
x1x2 + y1y2.
In other words, the dot product is obtained by multiplying corresponding coordinates of the two vectors and then adding the results.
So -2 + 20 = 18?
yes that is correct
for future ref, the cross product of 2 vectors will result in a vector that ins the direction that is perpendicular to both of the vectors in this case, the 2 vectors are in a plane so the cross will exist completely in the Z direction <0,0,Z>