Question 1204a

Vectors I: Basics, Dot and Cross Products
Lengths of Projection

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Given the vectors a=(841){\mathbf{a}=\begin{pmatrix} 8 \\ - 4 \\ 1 \end{pmatrix}} and b=(841),{\mathbf{b}=\begin{pmatrix} - 8 \\ - 4 \\ 1 \end{pmatrix},} what is the length of projection of a{\mathbf{a}} onto b?{\mathbf{b}?}

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