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 October 25th, 2016, 03:31 AM #1 Newbie   Joined: Oct 2016 From: Australia Posts: 2 Thanks: 0 Help with question So I did method 2, but I have no idea what it means for method 1 and 3. Any help would be greatly appreciated, thanks. Last edited by skipjack; October 25th, 2016 at 04:33 AM.
 October 25th, 2016, 04:58 AM #2 Newbie   Joined: Oct 2016 From: Australia Posts: 2 Thanks: 0 I don't know how to edit, but I've done method 3; I just don't know what to do for method 1. Last edited by skipjack; October 25th, 2016 at 05:31 AM.
 October 25th, 2016, 05:32 AM #3 Global Moderator   Joined: Dec 2006 Posts: 19,066 Thanks: 1622 For (3), x(5 - 2x) = 2(5/4)² - 2(5/4 - x)², so greatest area is 2(5/4)²m², etc.
 October 26th, 2016, 12:12 AM #4 Senior Member   Joined: Apr 2014 From: UK Posts: 871 Thanks: 316 I make it (5/3)^2
October 26th, 2016, 06:42 AM   #5
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Quote:
 Originally Posted by weirddave I make it (5/3)^2
Do you see that one dimension would be x, and the other dimension would be (5 - 2x)?

The area is x(5 - 2x).

After taking the derivative, setting it equal to 0 and solving for x, and substituting that back into
the area expression, please check the area again to see if you come up with skipjack's answer.

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