A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) m

A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) m

题目
A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?
(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2
选B.怎么做?谢谢!
答案
举一反三
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