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Question
If `bar("a") = 4hat"i" + 3hat"k"` and `bar("b") = -2hat"i" + hat"j" + 5hat"k"`, then find `2bar("a") + 5bar("b")`
Sum
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Solution
`2bar("a") + 5bar("b")`
= `2(4hat"i" + 3hat"k") + 5(-2hat"i" + hat"j" + 5hat"k")`
= `8hat"i" + 6hat"k" -10hat"i" + 5hat"j" + 25hat"k"`
= `- 2hat"i" + 5hat"j" + 31hat"k"`
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