Did you meanor this ? If you mean the first, then type f(x) = 3sqrt(x) - 2 If you mean the second, then type f(x) = 3sqrt(x-2) That's why parentheses were invented, so people could explain what they mean by grouping words or mathematical expressions together. Without parentheses, algebra would be chaotic. Also to show exponents you must use this symbol ^ between the base and the exponent. x3 just means 3x, but x^3 means x3. By the way, none of those choices could possibly be the inverse function of a function involving the square root function. It would have to be of degree 2, but all the choices you gave are either of degree 3 or 1. So I think you copied the choices from the wrong problem. Edwin