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9. D. 2
* maaf, saya mungkin bisa salah, karena saya tidak sepintar yang Anda pikirkan, disini kita sama-sama belajar, terima kasih
L = (2x+24)(8-x)
= 16x-24x+192-2x²
= 192-8x-2x²
maka
L' = -8 -4x
agar luas maksimum L' = 0
-8 -4x = 0
- 4x = 8
x = 8/-4 = -2
jadi agr luas maksimum
panjang = 2x+24 = 2 -2 + 24 = -4 + 24 = 20 cm
lebar = 8-x = 8-(-2) = 8+2 = 10 cm
yang no. 9 kurang jelas soalnya....