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JAMB Mathematics 1993 Question 17

Question 17

Algebraic Expressions

If the function f is defined by
f(x + 2) = 2x2 + 7x − 5, find f(−1).

  1. A.−10
  2. B.−8
  3. C.4
  4. D.10
Show the answer and explanation

Answer: B (−8)

Explanation

x + 2 = −1 when x = −3. Then f(−1) = 2(9) + 7(−3) − 5 = 18 − 21 − 5 = −8.