Question

How do you graph `f(x)=2 \cdot 3^x`?

Answer 1

Well, I would start by recognizing that the function will never become negative, i.e., for every value of `x` I may choose, `y` will always be positive.
So, basically, I'll have a graph in the first and second quadrant.
I'll now try to give values of `x` but choosing values that are "easy" to be calculated (try to avoid difficult stuff such as `x=125`, you won't calculate `3^125`!).
You can use:
`x=0` that gives you `y=2` (`3^0=1`);
`x=1` that gives you `y=6`;
And...

Or more formally:
graph{2*3^x [-5.165, 4.835, -0.96, 4.04]}