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lebar L = 12 - x²
Luas persegi panjang
A = P × L
A = 2x (12 - x²)
A = 24x - 2x³
nilai stasioner
A' = 24 - 6x²
0 = 24 - 6x²
x² = 4
x = -2 [TM] atau x = 2
Luas maksimum
A = 24x - 2x³
A = 24 • 2 - 2 • 2³
A = 48 - 16
A = 32 satuan luas ← jwb