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Luas persegi panjang = panjang * lebar
L = (5x+3) . (3x+1 )
L = (5x).(3x) + (5x).(1) + (3).(3x) + (3).(1)
L = 15 + 5x + 9x + 3 = 15 + 14x + 3
(5x+3) (3x+1)=
5x (3x+1) +3 (3x+1)
15x pangkat 2 + 5x + 9x + 3
15 x pangkat 2 +14x + 3