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(3x + 4) (x + 6) = 392
3x² + 22x + 24 = 392
3x² + 22x + 24 - 392 = 0
3x² + 22x - 368 = 0
(3x + 46) (x - 8) = 0
3x + 46 = 0
x = -46/3 (negatif tidak memenuhi)
x - 8 = 0
x = 8
p = 3x + 4
= 3(8) + 4
= 24 + 4
= 28 cm
l = x + 6
= 8 + 6
= 14 cm