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Maka,
Maka,
Diferensiasikan:
= [ 10(b²+24)-10b(2b) ]/(b²+24)²
Minimum/maksimum ketika:
10b²+240-12b² = 0
-2b²+240 = 0
b² = 120
b = √120 = 2√30 meter
Kalau ada yang keliru, harap informasinya.