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432 = PLT
T = 432/PL
T = 432/P²
f(x, y, z) = 3x + 2.4y + 5z
f(x, y, z) = 3x + 8y + 5z
x = P.P = P²
y = P.T = P(432/P²) = 432/P
z = P.P = P²
f(x, y, z) = 3x + 8y + 5z
= 3P² + 8(432/P) + 5P²
= 8P² + 3456/P
turunkan
16P - 3456/P² = 0
16P³ - 3456 = 0
P³ - 216 = 0
P³ = 216
P = 6
f(P) = 8P² + 3456/P
f(6) = 8(6)² + 3456/6
= 288 + 576
= 864