When the variable ”x” IS an exponent, we call the function an EXPONENT function. The form is f(x)=a.b^x. Where a is coefficient, b is the base and is the exponent (variable). Graphing this kind of function is different. It's a bent line. When the base is 1 or more than 1 the line moves down to up and left to right and when the base is between 1 and 0 the line moves down to up and left to right. The second thing is negative behind X and Y. When it is behind X, the symmetry line is Y, and when it's behind Y the symmetry line is X.