Asked by adad
|a| = 5, and b = 8, and the angle formed by a and b is 55°. Determine |4a + b|. Round
your answer to 2 d.p.
your answer to 2 d.p.
Answers
Answered by
oobleck
use the law of cosines.
|4a+b|^2 = |4a|^2 + b^2 - 2|4a|b cosθ
|4a+b|^2 = |4a|^2 + b^2 - 2|4a|b cosθ
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