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x/ 2 + y/4 = 4 (kali 4)
2x + y = 4
y = -2x + 4
P = x.y
P = x(-2x + 4)
P = -2x² + 4x
nilai ekstrim
P ' = 0
-4x + 4 = 0
x = 1
P = -2 (1)² + 4
= -2 + 4
= 2 (E)