Need help on algebra problem

Question

The exponential function f(x)=3^x is graphed below. Graph g(x)=2(3^x) on the same graph. Is g the result of a vertical stretch or a vertical strink of f? By what factor?

Answer 1

So, remember that g(x) is your y-value. What happens if the y-value is doubled? I had, say (3,27) that's now (3,54).