Expand your knowledge base with the help of IDNLearn.com's extensive answer archive. Discover trustworthy solutions to your questions quickly and accurately with help from our dedicated community of experts.

The point [tex]\((-1, 0.5)\)[/tex] lies on the graph of [tex]\(f^{-1}(x) = 2^x\)[/tex]. Based on this information, which point lies on the graph of [tex]\(f(x) = \log_2 x\)[/tex]?

A. [tex]\((-0.5, 1)\)[/tex]
B. [tex]\((0.5, -1)\)[/tex]
C. [tex]\((1, -0.5)\)[/tex]
D. [tex]\((1, 0.5)\)[/tex]


Sagot :

To determine the correct point that lies on the graph of the function [tex]\( f(x) = \log_2 x \)[/tex], let's analyze the given information step by step.

1. Given Information:
- The point [tex]\( (-1, 0.5) \)[/tex] lies on the graph of the inverse function [tex]\( f^{-1}(x) = 2^x \)[/tex].

2. Understanding the Inverse:
- The inverse function [tex]\( f^{-1}(x) = 2^x \)[/tex] means the original function [tex]\( f(x) \)[/tex] is [tex]\( \log_2 x \)[/tex], as the logarithm base 2 is the inverse operation of the exponentiation with base 2.
- If a point [tex]\((a, b)\)[/tex] lies on the graph of the inverse function [tex]\( f^{-1} \)[/tex], then the point [tex]\((b, a)\)[/tex] lies on the graph of the original function [tex]\( f \)[/tex].

3. Reversing Roles of the Point:
- Given that the point [tex]\( (-1, 0.5) \)[/tex] lies on [tex]\( f^{-1}(x) = 2^x \)[/tex],
- Based on the properties of inverse functions, the point [tex]\( (0.5, -1) \)[/tex] will lie on the graph of the original function [tex]\( f(x) = \log_2 x \)[/tex].

4. Conclusion:
- The point that lies on [tex]\( f(x) = \log_2 x \)[/tex] is [tex]\( (0.5, -1) \)[/tex].

Therefore, the correct answer is
[tex]\[ \boxed{(0.5, -1)} \][/tex]