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Is there any function of the form y=xa,0<α<1,that increases more slowly than a logarithmic function whose base is greater than 1? Explain.

Short Answer

Expert verified

There is no function in the formy=xa,0<α<1,

Step by step solution

01

Step 1. Introduction

An exponential function (with a base greater than 1)grows faster than a polynomial form fx=xn,n∈1,2,3,....We need to explain is there any function of the form y=xa,0<a<1that increases more slowly than a logarithmic function whose base is greater than1.

02

Step 2. Explanation

Since the exponential function is inverse to the logarithmic function,

fx=ax⇒f-1x=logax,a>1,and the polynomial is the inverse of the root fx=xn,n∈1,2,....

f-1x=xn=x1n=xα,α=1n,0<α<1,then the properties are inherited to the inverse function. That is we conclude that there is no function of the form y=xα,0<α<1,that increases more slowly than a logarithmic whose base is greater than1.

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