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S2 = x + 3
L.kubus2 - L.kubus1 = 234
6S2² - 6S1² = 234
6 (x+3)² - 6 (x²) = 234
6 (x²+6x+9) - 6x² = 234
6x²+36x+54 - 6x² = 234
36x + 54 = 234
36x = 180
x = 5 dm
●S1 = 5 dm
V1 = S^3
V1 = 5^3 = 125 dm^3
●S2 = 8 dm
V2 = S^3
V2 = 8^3 = 512 dm^3
selisih volume = 512 - 125
= 387 dm^3