回答:
x = -3或x = -1
说明:
#f = e ^ x,g = x ^ 2 + 2x + 1#
#f'= e ^ x,g'= 2x + 2#
#f'(x)= fg'+ gf'= e ^ x(2x + 2)+ e ^ x(x ^ 2 + 2x + 1)= 0#
#e ^ x(2x + 2 + x ^ 2 + 2x + 1)= 0#
#e ^ x(x ^ 2 + 4x + 3)= 0#
#E 1 X(X + 3)(X + 1)= 0#
#e ^ x = 0或x + 3 = 0或x + 1 = 0#
不可能, #x = -3或x = -1#
#F(-3)= E ^ -3(9-6 + 1)= 0.199# - >最大
#f(-1)= e ^ -1(1-2 + 1)= 0# - >分