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JAMB Mathematics 1985 Question 27

Question 27

Graphs of Functions

Find the missing value in the table below
x: −4, −3, −2, −1, 0, 1, 2, 3
y = 4 − 3x − x3: 80, ___, 18, 8, 4, 0, 10, 32

  1. A.−32
  2. B.−14
  3. C.40
  4. D.22
  5. E.37.
Show the answer and explanation

Answer: C (40)

Explanation

At x = −3: y = 4 − 3(−3) − (−3)³ = 4 + 9 + 27 = 40.