If f(x)=2xf(x) = 2^xf(x)=2x, what is f(x+1)f(x+1)f(x+1)?
2x+12^x + 12x+1
2⋅2x2 \cdot 2^x2⋅2x
2x+22^x + 22x+2
2x2\frac{2^x}{2}22x