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What's the dot product of u = <-9, 4> and v = <1,3>? Thanks!

What's the dot product of u = <-9, 4> and v = <1,3>? Thanks!
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What's the dot product of u = <-9, 4> and v = <1,3>? Thanks!

User Preets
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\langle-9,4\rangle\cdot\langle1,3\rangle=(-9)(1)+(4)(3)=-9-12=-21
User Malix
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