The left shift term of the equation can be transformed into the x power of a = x+a, and this moment can be regarded as the focus of an exponential function and a linear function. The original equation has two solutions, which means that exponential function and linear function now have two focuses. Then, according to the range of a, what the approximate image looks like when A is greater than 0 and less than 1, or what the two images look like when A is greater than 1. In order to satisfy the situation that there are two intersections, the answer is (1,+infinity).

This is the application chapter of function in the third chapter of compulsory three in senior one.