The algebraic expression of the exponential part of (1) is ax? -4x+3, and a=- 1 is known in the title, so obviously, if you substitute, you get -x? -4x+3, the rising interval is (-∞, -2) and the falling interval is (-2,+∞). After reduction, the form of the whole function is 1/3 t (t is the algebraic part), so when t monotonically increases, the whole formula is (1/3).

(2) The A value of the previous question is no longer applicable, and a new A value needs to be obtained according to the requirements of the question. It is known that the whole formula has reached the maximum value, that is to say, the algebraic formula T has reached the minimum value. Because the algebraic formula T is a standard quadratic function, according to the method of finding the maximum value of quadratic function, when x=- 1, the formula reaches the minimum value. So we can find the unknown a. So it is a decreasing function on (-∞, 2/a). Substituting f(x), it is easy to find the value of a. After substitution, a= 1. Problem solved.