Answer:
The answer to your question is log₁₀ x + b = a 
Explanation:
General formula
 Logarithmic function Exponential function
 log ₐ b = c 

a = antilogaritm c = exponent
b = base b = base 
c = logaritm a = power
In your problem
10 = base
a = exponent
x + b = power
Exponential function log₁₀ x + b = a