Solve the Exponential Equation Below Algebraically $$e ^ { 2 x } + 3 e ^ { x } - 18 = 0$$

Multiple Choice

Solve the exponential equation below algebraically. Round your result to three decimal places.
$$e ^ { 2 x } + 3 e ^ { x } - 18 = 0$$

A) $1.099$
B) $0.214$
C) $2.077$
D) $- 0.188$
E) $3.271$