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JAMB Mathematics 1990 Question 12

Question 12

Algebraic Expressions

If a = 2, b = −2 and c = −½, evaluate (ab2 − bc2)(a2c − abc)

  1. A.0
  2. B.−28
  3. C.−30
  4. D.−34
Show the answer and explanation

Answer: D (−34)

Explanation

ab2 − bc2 = 8 − (−½) = 8½ and a2c − abc = −2 − 2 = −4. The product is 8½ × (−4) = −34.