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Math Help - find all numbers x

  1. #1
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    find all numbers x

    if P=(-3,1) and Q=(x,4), find all numbers x such that the vector represented by PQ has lenght 5.

    thank you
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by alessandromangione View Post
    if P=(-3,1) and Q=(x,4), find all numbers x such that the vector represented by PQ has lenght 5.

    thank you
    what have you tried here?

    what does PQ look like? how would you find it's size?
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  3. #3
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    PQ must be like the resultant of a triangle formed by Q and P right?
    I tried to find the vector of P and the 5 ( PQ) divided by the vector P...then this result divided by 4....
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by alessandromangione View Post
    PQ must be like the resultant of a triangle formed by Q and P right?
    I tried to find the vector of P and the 5 ( PQ) divided by the vector P...then this result divided by 4....
    ...huh? i think you are thinking about adding vectors P and Q. First, P and Q are not vectors here, thet are points. and you are not adding them

    PQ = < x - (-3), 4 - 1 > = < x + 3, 3>

    now finish up
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