Jawapan

2016-10-15T14:05:24+08:00
2x + y = 220m
y = 220-2x

luas, L= xy = x(220-2x) = 220x - 2x^2
luas maksimum = dl/dx = 0
=220-4x=0
x = 55

L = 220x - 2x^2
= 220(55) - 2(55)^2
= 6050