Kakak2 ini soal turunan tolong bantu dong…

34) misal x dan y
y + x² = 75
y = 75 – x²
x.y = x(75 – x²) = 75x – x³
nilai terbesar turunan = 0
75 – 3x² = 0
3x² = 75
x² = 25
x = 5
y + 25 = 75
y = 50
hasil kali x.y = 5×50 = 250

35) laba = 5.000x – (9000 + 1000x + 10x²)
= 5000x – 9000 – 1000x – 10x²
= -9000 + 4000x – 10x²
turunan = 0
4000 – 20x = 0
20x = 4000
x = 200

laba = 5000(200) – (9000 + 1000(200) + 10(200)²)
= 1.000.000 – (9000 + 200.000 + 400.000)
= 1.000.000 – (609.000)
= 391.000