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K = 24 m
L = 35 m²
Jwab:
K = 2(p+l)
24 = 2(p+l)
24/2 = p+l
12 = p+l
l = 12-p
L = p x l
35 = p(12-p)
35 = 12p-p²
p²-12p+35 = 0
(p-7)(p-5) = 0
p=7 atau p=5
Jika:
p=7
l = 12-p
l = 12-7
l = 5
p=5
l = 12-p
l = 12-5
l = 7
Karena panjang dan lebar hasilnya sama,maka:
panjang = 7 m dan lebar = 5 cm atau panjang = 5 cm dan lebar = 7 cm
Salam...... ^^