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p = 16-2x
l = 16-2x
t = x
V = pxlxt
V = (16-2x) (16-2x) (x)
V = 256x - 64 x^2 +4x^3
V' = 0
256 - 128 x + 12 x^2 = 0
64- 32 x + 3x^2 = 0
(3x-8) ( x -8 ) = 0
x = 8/3 atau x =8
jawabnya x =8/3