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L = p x l
L = p x (p - 5)
L = p² - 5p
84 = p² - 5p
0 = p² - 5p - 84
0 = p² - 12p + 7p - 84
0 = p(p -12) + 7 (p - 12)
0 = (p - 12) + (p + 7)
kemungkinan =>
p - 12 = 0 => p = 12 m
atau
p + 7 = 0
p = -7 (* tidak mungkin)
jadi yg paling mungkin adalah p = 12 m
maka l = 12 m - 5m = 7 m