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JAMB Mathematics 1989 Question 14

Question 14

Algebraic Expressions

Find the value of the expression (32/81)x3 − (64/27)x2 − (81/16)x−3 when x = −3/4

  1. A.10½
  2. B.10⅙
  3. C.3⅜
  4. D.−13½.
Show the answer and explanation

Answer: A (10½)

Explanation

x³ = −27/64, x² = 9/16 and x−3 = −64/27. The terms are −1/6, −4/3 and +12, which add up to 10½.