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Verified answer
Aplikasi Turunan• Luas
Persegi Panjang
Luas = p × l
L = 2(1/2 x² - 3x + 50)
L = x² - 6x + 100
Agar luas maksimum : L' = 0
L' = 0
2x - 6 = 0
2x = 6
x = 3 cm