Der the following functions. f(x)=-3x and g(x)=√(x+1). Find the formula for (f+g)(x) and simplify your answer. Then find the domain for (f+g)(x). Round your answer to two decimal places.

A) f(x)+g(x)
B) -3x+√(x+1)
C) -3x²+√(x+1)
D) -3x+√(x+1)

Choose the correct option: