p(x) = 2x^3 - 113 is shifted x^3. Therefore, it is one-to-one function over the entire domain< x < and maps the real number line by an one-to-one way onto itself. To find the inverse function, express first x via p: x = and then replace x by y and p by x. You will get the expression for the inverse function y = . (1) To calculate y(137), simply substitute 137 instead of x into the formula (1). You will get y = = = 5.