College Math CLEP Prep Practice Exam

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Which of the following is not a solution for the equation ln x = -1?

0.5
-1
0
0.3678

The correct answer is: -1

The given equation, ln x = -1, can be rewritten as e^-1 = x. This shows that x must be a positive value, as the value of e^-1 is a positive number. Option B, -1, is a negative value and therefore, not a possible solution for the equation. Option A, 0.5, is a valid solution as e^-1 is equal to approximately 0.3678. Option C, 0, is not a valid solution as ln 0 is undefined. Option D, 0.3678, is the same as option A and is therefore also a valid solution.