# How do you determine if y=2(4)^x is an exponential growth or decay?

When $y = a {\left(b\right)}^{x}$, it is an exponential growth when $b > 1$, exponential decay when $b < 1$, and a straight line when $b = 0$
Since $b = 4 , 4 > 1 , b > 1$ it is exponential growth.