What is f(5)x if f(x)= 3ln(x)?

Answer 1

I'm assuming you mean f⁵(x), which represents the 5th derivative of f(x):

f(x) = 3ln(x)

f'(x) = 3/x

f''(x) = -3/x²

f³(x) = 9/x³

f⁴(x) = -36/x⁴

f⁵(x) = 180/x⁵

Hope this helped!