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    Been stuck on this question and was wondering if you guys could help me out.

    Given |vector x| = 13, |vector y|= 19, and |vector x - vector y| = 22, find |vector x + vector y|.

    Thanks in advance.
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    Have you covered the dot product?
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    Yes, but this question is supposed to be done without it.
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    (Original post by Wandering)
    Been stuck on this question and was wondering if you guys could help me out.

    Given |vector x| = 13, |vector y|= 19, and |vector x - vector y| = 22, find |vector x + vector y|.

    Thanks in advance.
    May be you could use a formular of a^2 - b^2 = (a+b)(a-b)
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    (Original post by Wandering)
    Yes, but this question is supposed to be done without it.
    In that case, I'd suggest drawing a diagram; should look something like a parallelogram; mark on your 4 vectors.
 
 
 
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