4. Which of the following is an exponential function? O f(x) = 3x^3
O f(x) = 3^x
O f(x) = 5x-6
O f(x) = 2/x​

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.