no 2 dan 36 , mohon bantuannya ya :)

f(x) = (10x + 5) / (6 - 3x)
f'(x) = (10(6 - 3x)) - (10x + 5)(-3)) / (6 - 3x)²
f'(x) = (60 - 30x + 30x + 15) / (6 - 3x)²
f'(x) = 75/(6 - 3x)²
f'(-3) = 75/(6-3(-3))²
f'(-3) = 75/(6+9)²
f'(-3) = 75/15²
f'(-3) = 75/225
f'(-3) = ⅓