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JAMB Mathematics 2020 Question 31

Question 31

Graphs of Functions

Find the missing point I value in the following road?
x: −2, −1, 0, 1, 2, 3
y = x³ − x + 3: ___, 3, 3, 3, 9, 27

  1. A.−9
  2. B.−3
  3. C.−5
  4. D.13
Show the answer and explanation

Answer: B (−3)

Explanation

At x = −2: y = (−2)³ − (−2) + 3 = −8 + 2 + 3 = −3.