kak, tolong yang nomer 32, 35 sama 37... kamu gak mgerti kak

35) u/v turunannya (u'v - v'u)/v²
f'(x) = (6x(2x+1) - 2(3x²)) / (2x+1)²
= (12x² + 6x - 6x²) / (2x+1)²
= (6x² + 6x) / (2x+1)²
= 6x(x+1) / (2x+1)²

37) b(x) = (4x - 800 + 120/x)x
b(x) = 4x² - 800x + 120
minimum saat turunan = 0
8x - 800 = 0
8x = 800
x = 100