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Math Help - modulus

  1. #1
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    modulus

    there's three point on a graph.
    pointA(6,4), point B(-k,2), point C(-5,4).
    the question wants to find the area of the triangle formed by this three point and express it in terms of k.
    thus,
    area of the triangle formed = -11-4k
    since area has to be positive, so i put modulus? = |-11-k| in order to get positive answer.

    but |m|= +-m. true?

    so, what is answer the area of the triangle? if i did not use modulus, area of the triangle might be negative. but if i use modulus,|m|= +-m.

    confused!
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  2. #2
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    Quote Originally Posted by z1llch View Post
    there's three point on a graph.
    pointA(6,4), point B(-k,2), point C(-5,4).
    the question wants to find the area of the triangle formed by this three point and express it in terms of k.
    thus,
    area of the triangle formed = -11-4k
    since area has to be positive, so i put modulus? = |-11-k| in order to get positive answer.

    but |m|= +-m. true?

    so, what is answer the area of the triangle? if i did not use modulus, area of the triangle might be negative. but if i use modulus,|m|= +-m.

    confused!
    I haven't checked your answer.

    But |m|= + - m, that is true.
    However, it is always positive.
    Indeed, if m is positive, then |m|=+m. If m is negative, |m|=-m, which is positive.
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