s^2 = 20^2 = 400
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- Solution: Let the side length of the square be $ s $. The perimeter of a square is $ 4s $, so we have:
- 4s = 80 \Rightarrow s = 20
- The area of the square is then:
- Thus, the maximum area that can be monitored is:
- \boxed{400}
- Question: A clean energy startup models the efficiency of a solar panel using the function $ E(u) = u - \frac{u^4}{4} $, where $ u $ represents normalized sunlight intensity. If $ b_n $ is defined by $ b_1 = 1 $ and $ b_{n+1} = E(b_n) $, find the value of $ b_4 $.
