a. Use the definition of logarithm to show that logbbx = x for all real numbers x. b

Chapter 11, Problem 10

(choose chapter or problem)

a. Use the definition of logarithm to show that \(\log _{b} b^{x}=x\) for all real numbers x.

b. Use the definition of logarithm to show that \(b^{\log _{b} x}=x\) for all positive real numbers x.

c. By the result of exercise 25 in Section 7.3, if \(f: X \rightarrow Y\) and \(g: Y \rightarrow X\) are functions and \(g \circ f=I_{X}\) and \(f \circ g=\) \(I_{Y}\), then f and g are inverse functions. Use this result to show that \(\log _{b}\) and \(\exp _{b}\) (the exponential function with base b ) are inverse functions.

Text Transcription:

log _b b^x=x

b^log _b x=x

f: X \rightarrow Y

g: Y \rightarrow X

g \circ f=I_X

f \circ g=

I_Y

log _b

exp _b

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