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A matrix–vector product

EasyLinear Algebra~2m

For A=(1234)A=\begin{pmatrix}1&2\\3&4\end{pmatrix} and v=(11)v=\begin{pmatrix}1\\1\end{pmatrix}, what is the first entry of AvAv?

Show hints (2)+
  1. Row 1 dotted with the vector.
  2. $1\cdot1+2\cdot1$.

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