20
QuizMultiple Choice

Solving One-Variable Inequalities — Unit test

Question 20 • AZ-Algebra 1A (MA101)

Johan found that the equation –2|8 – x| – 6 = –12 had two possible solutions: x = 5 and x = –11. Which explains whether his solutions are correct?

Answer
A
He is correct because both solutions satisfy the equation.
B
He is not correct because he made a sign error.
C
He is not correct because there are no solutions.
D
He is not correct because there is only one solution: x = 5.

Explanation

Add 6 to both sides and divide by −2: |8 − x| = 3. This gives 8 − x = 3 or 8 − x = −3, so the solutions are x = 5 and x = 11. Johan’s x = −11 is incorrect, so he made a sign error; choice B is correct.

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