Question

A fence is to enclose a rectangular vegetable farm with an area of 400 square meters, if x is the length of one side of this fence, find a function P(x) representing the perimeter of the fencing material.​

Answer 1

X is the length of one side of this fence

area of 400 square meters A = Lw

A = 400 = x (400/x)

P = 2L + 2w

P(x) = 2x + 2(400/x)

P(x) = 2x + 800/x

2x + 800/x meters