Question 1201c

Vectors I: Basics, Dot and Cross Products
Parallel Vectors

Question

Find a vector a{\mathbf{a}} that is parallel to
b=4i5jk\mathbf{b} = 4 \mathbf{i} - 5 \mathbf{j} - \mathbf{k}
such that ab.{\mathbf{a}\neq \mathbf{b}.}

Attempt

a={\mathbf{a}= }
({\Biggl(}
){\Biggr)}

Answer

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