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WAEC Mathematics 1993 Question 9

Question 9

Algebraic Expressions

Factorize the expression 2s2 − 3st − 2t2.

  1. A.(2s − t)(s + 2t)
  2. B.(2s + t)(s − 2t)
  3. C.(s + t)(2s − t)
  4. D.(2s + t)(s − t)
  5. E.(2s + t)(s + 2t)
Show the answer and explanation

Answer: B ((2s + t)(s − 2t))

Explanation

Split −3st as −4st + st: 2s(s − 2t) + t(s − 2t) = (2s + t)(s − 2t).