Given real numbers a,b > 1.
True of false? The exponential functions a^x and b^x are of the same order exactly when a≤b.

Respuesta :

Answer:

FALSE

Step-by-step explanation:

Recall that a function f(x) is of exponential order c, if there exists a constant M such that and a real r such that

[tex]|f(x)|\leq Me^{cx}\;(x\geq r)[/tex]

Now, take a = 2.5 and b = 2

The functions

[tex]f(x)=(2.5)^x\;g(x)=2^x[/tex]

are both exponential of order 1, since  

[tex]\lim_{x \to \infty}\frac{f(x)}{e^x}=\lim_{x \to \infty}\frac{g(x)}{e^x}=0[/tex]

but a>b