Which of the following logarithmic expressions is undefined?(1 point)

Question

Responses

log3 −9
logarithm subscript 3 baseline negative 9

log3 27
logarithm subscript 3 baseline 27

log0.25 64
logarithm subscript 0.25 baseline 64

log2.5 6.25

Answer 1

The expression that is undefined among the given options is:

log3 -9

Logarithms are only defined for positive numbers. Since -9 is negative, the logarithmic expression \( \log_3 (-9) \) is undefined. The other expressions are well-defined because their arguments (27, 64, and 6.25) are all positive numbers.