23.1k views
0 votes
For what values of b does the function f(x) = bˣ satisfy

lim f(x) = 0 and lim f(x) = [infinity]?
x→[infinity] x→[infinity]

1 Answer

2 votes

Final answer:

No single value of b can satisfy both limits for the function f(x) = bx as x approaches infinity. For the limit to be zero, b must be between 0 and 1, and for the limit to be infinity, b must be greater than 1.

Step-by-step explanation:

The question is asking for the values of b for which two specific limits of the function f(x) = bx are obtained: the limit as x approaches infinity where f(x) approaches zero, and the limit as x approaches infinity where f(x) approaches infinity. To solve this, we consider the properties of exponential functions.

For f(x) = bx to satisfy lim f(x) = 0 as x → ∞, b must be a number between 0 and 1 (0 < b < 1). This is because as x increases without bound, an exponential function with a base that is a fraction will approach zero.

Conversely, for f(x) = bx to satisfy lim f(x) = ∞ as x → ∞, b must be greater than 1 (b > 1). When the base of an exponential function is greater than 1, the function's value will increase without bound as x increases.

In summary, no single value of b can satisfy both conditions simultaneously. The values of b that satisfy each condition are mutually exclusive.

User Asael
by
7.5k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories