Question

In the equation x (t) = be^at if a < 0, then it is called ______

(a) Growing exponential

(b) Decaying exponential

(c) Complex exponential

(d) Both Growing and Decaying exponential

This question was addressed to me by my school principal while I was bunking the class.

This interesting question is from Elementary Signals in chapter Signals and Systems Basics of Signals and Systems

Answer 1

The correct choice is (b) Decaying exponential

Explanation: If a > 0 in x (t) = be^at it is called growing exponential and if <0 it is called decaying exponential. Hence Decaying exponential is correct.