To write the given equation in logarithmic form, we should recall the definition of a logarithm.
x= b^y ⇔ log_b x=y
The above relationship tells us that the logarithm y is the exponent to which b must be raised to get x. Let's now apply the definition to the given equation.
4^(- 1)= 1/4 ⇔ log_4 14=- 1
The above means that - 1 is the exponent to which 4 must be raised to obtain 14.