Problemas
Both of these functions grow as x gets larger and larger. Which function eventually exceeds the other? f(x)=5x^2-8 g(x)=3^x
Roztwór
Horacio
élite · Tutor durante 8 años
3.4
(315 Votos)
Respuesta
To determine which function eventually exceeds the other as
gets larger, we need to analyze the growth rates of the two functions:
### Analysis of Growth Rates1. **Quadratic Function \( f(x) = 5x^2 - 8 \)**: - The term
dominates the behavior of the function for large values of
. - The growth rate of a quadratic function is proportional to
.2. **Exponential Function \( g(x) = 3^x \)**: - The term
grows exponentially. - The growth rate of an exponential function is proportional to the function's current value, meaning it increases faster and faster as
increases.### Comparison of Growth RatesFor large values of
, exponential growth outpaces quadratic growth. This can be understood by comparing the rates of increase:- For
sufficiently large,
will grow much faster than
.To provide a more concrete comparison, let's calculate the values of \( f(x) \) and \( g(x) \) for a few large values of
:- For
:
- For
:
From these calculations, it is evident that \( g(x) = 3^x \) grows much faster than \( f(x) = 5x^2 - 8 \) for large values of
.### ConclusionThe exponential function \( g(x) = 3^x \) will eventually exceed the quadratic function \( f(x) = 5x^2 - 8 \) as
gets larger.