# FNGR 1 | Lesson 1 | Practice (Identifying Exponential)

Identify each function as linear or exponential and explain why it is either linear or exponential.  Check the function growth at $$x=0, 1$$ and $$2$$.

1) $$f(x)=3x$$

2) $$f(x)= \left( \Large \frac{2}{3} \right) ^x$$

3) $$f(x)=-4^x$$  and  $$f(x) = 4^x$$?

4) $$f(x)=7(2)^x$$

5) $$f(x)=7(0.5)x$$