Answer
$-6$
Work Step by Step
Step 1: $3\textbf {u}\cdot\textbf {v}$
Step 2: $3\cdot\langle -2,1 \rangle\cdot\langle 3,4 \rangle$
Step 3: $\langle -6,3\rangle\cdot\langle 3,4\rangle$
Step 4: $-6(3)+3(4)$
Step 5: $-18+12$
Step 6: $-6$
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