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p = l + 3
l = x
k < 26
k = 2(p+l)
a) 2(x+3 + x) < 26
2(2x + 3) < 26
b) 2(2x + 3) < 26
4x + 6 < 26
4x < 20
x < 5
jd lebar < 5
panang < 8
no 2)
panjang = 3x + 2
lebar = 2x + 5
keliling <= 74
2(p+l) = K
2(3x+2 + 2x+5) <= 74
2(5x + 7) <= 74
10x + 14 <= 74
10x <= 60
x <= 6
panjang maksimum = 3(6) + 2 = 20
lebar maksimum = 2(6) + 5 = 17
luas maksimum = 20(17) = 340