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OpenStudy (anonymous):
Find a • b. a = 5i + 7j, b = -4i + 3j
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OpenStudy (anonymous):
I got <-20,21> but I wasn't sure so I added and got 41. I don't know which one would be right.
OpenStudy (anonymous):
(5i + 7j) (-4i +3j) -20i^2 + 15ij - 28ij + 21j^2 -20i^2 -13ij + 21j^2
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