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panjang dan lebar sisi kotak = x - 2 - 2 = x - 4
tinggi = 2
V= (x-4).(x-4).2 = 2x²-16x+32
b.) domain fungsi
V > 0
2x²-16x+32 > 0
(x-4)².2 > 0
(x-4)² > 0
x-4 > 0
x > 4