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L = p × l
84 = p ( p - 5 )
84 = p² - 5p
0 = p² - 5p - 84
0 = ( p - 12 ) ( p + 7 )
p = 12 atau p = -7
Karena tidak mungkin panjang itu negatif, maka :
p = 12 cm
l = p - 5 = 12 cm - 5 cm = 7 cm