# Chapter 12 - Section 12.5 - Logarithmic Functions - Vocabulary and Readiness Check: 6

($0 , \infty$)

#### Work Step by Step

The domain of a function is every valid input, that is every valid value of x. The argument of a logarithmic function has to be a positive number, otherwise it is undefined. Thus the valid inputs of $y = log_2x$ are all positive number, which in interval notation is ($0 , \infty$)

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