Wednesday, March 17, 2010

Square Root

Suppose M and m are positive numbers, with M greater than m. Does the square root of the square of  (m - M):

sqrt((m - M)(m - M))

equal

(m - M) ?
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1 comment:

  1. jrMarch 17, 2010 at 10:30 AM

    No.

    sqrt((m - M)(m - M)) = (M - m), and not (m - M),
    because the square root of a positive number is always positive. (m - M) is negative.

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