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L = 126 m²
L = p × l
126 = p × (p - 5)
126 = p² - 5p
0 = p² - 5p - 126
0 = p² + 9p - 14p - 126
0 = p(p + 9) - 14(p + 9)
0 = (p - 14) (p + 9)
p - 14 = 0
p = 14 m
l = p - 5
= 14 cm - 5
= 9 m
Jadi panjang dan lebarnya berturut-turut adalah 14 m dan 9 m (B).