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72 cm2 = (3x - 3)(x + 1)
72cm2 = (3x + x) ( -3 + 1)
72cm2 = 4x . -2
72/-2 = 4x
-36=4x
-9=x
L = x + 1
L = -9 + 1
L = 8
72 cm2= (3x-3)×(x+1)
=3xkuadrat-3
3xkuadrat= 72cm2+3
=75
x2=75/3=25 diakarkan
x= 5