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rusuk2=3+x
selisih luas kubus --> L=L2-L1
234=6.r2^2 - 6.r1^2
234=6.(3+x)^2 - 6.(x)^2
234=6.(9+6x+x^2) - 6x^2
234=54+36x
x=5
rusuk1= 5 ; rusuk2=x+3=8
selisih volume= r2^3 - r1^3
= 8^3 - 5^3
= 387
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