How do you find the component form of $v=u-2w$ given $u=2i-j, w=i+2j$ ?

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Answer 1 · 2017-02-23T17:11:20

$v=-5j$

As $u=2i-j$ and $w=i+2j$

and $v=u-2w$ , it can be expressed as

$v=(2i-j)-2(i+2j)$

= $2i-j-2i-4j$

= $0-5j$

How do you find the component form of v=u-2wv=u-2w given u=2i-j, w=i+2ju=2i-j, w=i+2j?