Answer: In 18, find (a) 3a, (b) a b, (c) a b, (d) ia bi, and (e) ia 2 bi
Chapter 7, Problem 7(choose chapter or problem)
In Problems 1–8, find (a) 3a, (b) a+b, (c) a-b, (d) ||a+b||, and (e) ||a - b||.
\(\mathbf{a}=-\mathbf{b}, \mathbf{b}=2 \mathbf{i}-9 \mathbf{j}\)
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