7
QuizMultiple Choice

Solving Absolute Value Equations

Question 7 • (OC27) MATH COLL ALGEBRA-1200710-S1-Degele-VOL7006P

Misha found that the equation –|2x – 10| – 1 = 2 had two possible solutions: x = 3.5 and x = –6.5. Which explains whether or not her solutions are correct?

Answer
A
She is correct, because both solutions satisfy the equation.
B
She is not correct, because she made a sign error.
C
She is not correct, because there are no solutions.
D
She is not correct, because there is only one solution: x = 3.5.

Explanation

An absolute value is always zero or positive, so −|2x − 10| is always zero or negative. Subtracting 1 makes the left side at most −1, so it can never equal 2. Therefore, there are no solutions, and Misha’s proposed values are not correct.

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