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29 December, 00:31

Find the dimensions of a rectangle with perimeter 100 m whose area is as large as possible. (if both values are the same number, enter it into both blanks.)

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  1. 29 December, 02:52
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    dA/dx = 100 - 4x & the 2nd derivative is - 4 [i. e. - ve]

    so setting dA/dx to zero will give a maxima

    100 - 4x = 0

    so x = 25 m

    in other words, a rectangle with a given perimeter has the maximum area when it is a square
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