Choose the correct expression for \(f(x)\) given in the graph.

2016

Choose the correct expression for \(f(x)\)Β given in the graph.

  1. A.

    \(𝑓(π‘₯) = 1 βˆ’ |π‘₯ βˆ’ 1|\)

  2. B.

    \(𝑓(π‘₯) = 1 + |π‘₯ βˆ’ 1| \)

  3. C.

    \(𝑓(π‘₯) = 2 βˆ’ |π‘₯ βˆ’ 1| \)

  4. D.

    \(𝑓(π‘₯) = 2 + |π‘₯ βˆ’ 1| \)

Attempted by 31 students.

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Correct answer: C

Key features: the graph is a V-shaped (absolute value) curve with a peak at (1, 2) and straight lines of slope Β±1 on either side.

  • Vertex (peak) at x = 1 with value 2, so the formula should use |x βˆ’ 1| and be centered at 1 with a constant term 2.

  • The graph is upside down (a maximum at the vertex), so the absolute value is subtracted from 2 rather than added.

  • Slopes on the sides are Β±1, so the coefficient in front of |x βˆ’ 1| is 1.

Putting these together gives: f(x) = 2 βˆ’ |x βˆ’ 1|

Quick checks:

  1. At x = 1: f(1) = 2 βˆ’ |1 βˆ’ 1| = 2, matching the peak.

  2. At x = 3: f(3) = 2 βˆ’ |3 βˆ’ 1| = 0, matching the plotted point near (3, 0).

  3. At x = βˆ’3: f(βˆ’3) = 2 βˆ’ |βˆ’3 βˆ’ 1| = βˆ’2, consistent with the left-side value shown.

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