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Math Help - Vectors dot prodoct question/clarification

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    Vectors dot prodoct question/clarification

    In the following question, would the answer be 22.5 or -22.5?



    The answer in the back of the book says 22.5 so I'm not sure if I'm missing something or if it's a typo.
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    \vec{a}\cdot\vec{b}=\|\vec{a}\|\|\vec{b}\|\cos(\al  pha)
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    Quote Originally Posted by IanCarney View Post
    In the following question, would the answer be 22.5 or -22.5?



    The answer in the back of the book says 22.5 so I'm not sure if I'm missing something or if it's a typo.
    The answer is correct. Notice that the vectors are not lined up tail to tail. What did you try and what did you get.
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    Quote Originally Posted by TheEmptySet View Post
    The answer is correct. Notice that the vectors are not lined up tail to tail. What did you try and what did you get.
    Ah, I see. Thanks, I get it now.
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