Calculus...again

I'm gonna have abunch of questions, cause I have a test. >_<

If you planened to fence a rectangular pasture that must contain 4000 sq meters, what dimensions would require the least amount of fencing?


Perimeter= 2l + 2w
area= lw=4000
or l=4000/w
P= 2(4000/w + w)

Now minimize this function, solve for w.

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