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keliling = 2(p+l)
100 = 2(x+l)
50 = x+l
L = p.l; subtitusi l= 50-x
L = x(50-x)
L = 50x - x²
Keliling = 100
2(p+l) = 100
p + l = 50
l = 50 - p
l = 50 - x
luas ≥ 600
p. l ≥ 600
x (50-x) - 600 ≥ 0
50x - x² - 600 ≥ 0
x² - 50x + 600 ≤ 0