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392 = (3x + 4) (x +6)
392 = 3x²+18x+4x +24
368 = 3x²+22x
3x²+22x-368=0
(3x + 46 ) (x - 8 ) =0
x = 8 cm
Panjang = 3. 8 + 4 = 28 cm
Lebar = 8 + 6 = 14 cm