Find the derivative of $$f (x) = 5 (x+3)$$.
See development and solution
Development:
$$f (x) = 5 (x+3) = 5x+15$$
The derivative of a linear function $$f (x) =Ax+B$$ is equal to $$A$$. Therefore, $$A=5$$ and $$B=15$$, so, $$f'(x) = 5$$.
Solution:
$$f'(x)=5$$