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If f(x)=|x-7|, what values can x have when f(x)=11?

Answer and explanation

Correct answer: x=18 or x=-4

The governing concept is solving an absolute-value equation. Since f(x)=11, substitute this value to obtain |x-7|=11. An absolute value equal to a positive number has two branches: x-7=11 or x-7=-11. The first equation gives x=18, while the second gives x=-4. Both values are valid because |18-7|=11 and |-4-7|=11. Option A is therefore correct. Option D incorrectly keeps only the positive branch, and options B and C result from changing signs or subtracting incorrectly. Always consider both directions from 7 on the number line when solving |x-a|=b.

Related tags

Real-Valued-FunctionsModulusAbsolute-Value-EquationReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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