Question 1204a

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

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Given the vectors a=(3−6−2){\mathbf{a}=\begin{pmatrix} 3 \\ - 6 \\ - 2 \end{pmatrix}} and b=(2−12),{\mathbf{b}=\begin{pmatrix} 2 \\ - 1 \\ 2 \end{pmatrix},} what is the length of projection of b{\mathbf{b}} onto a?{\mathbf{a}?}

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