For which of the following functions is f(a+b)=f(a)+f(b) for all positive numbers a and b?
f(x)=x^2
f(x)=x+1
f(x)=sqrt(x)
f(x)=2/x
f(x)=-3x
What's the best way to solve this without trying each answer choice? Had I looked at choice E first, I would have recognized the use of distributive property and that E was the right answer but instead I started by trying all the answer choices in order.
f(x)=x^2
f(x)=x+1
f(x)=sqrt(x)
f(x)=2/x
f(x)=-3x
What's the best way to solve this without trying each answer choice? Had I looked at choice E first, I would have recognized the use of distributive property and that E was the right answer but instead I started by trying all the answer choices in order.
