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Math Help - Dot Product Question

  1. #1
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    Dot Product Question

    Maybe I'm overlooking the simplicity of the question, but I keep coming up with answers separate to the given answer.

    The angle between \vec a and \vec b is 79 deg.

    Find p if \vec a = 6\vec i + 3 \vec j - 2 \vec k and \vec b = -2 \vec i + p \vec j - 4\vec k

    Thanks in advance.
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  2. #2
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    Quote Originally Posted by gordonparsons View Post
    Maybe I'm overlooking the simplicity of the question, but I keep coming up with answers separate to the given answer.

    The angle between \vec a and \vec b is 79 deg.

    Find p if \vec a = 6\vec i + 3 \vec j - 2 \vec k and \vec b = -2 \vec i + p \vec j - 4\vec k

    Thanks in advance.

    We know (hopefully) that \cos 79 = \frac{\vec a\cdot \vec b}{||\vec a\|\|\vec b\|} ....well, do the math.

    Tonio
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