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WAEC Mathematics 2005 Question 13

Question 13

Algebraic Expressions

Expand (2x − 3y)(x − 5y)

  1. A.2x2 + 13xy − 15y2
  2. B.2x2 − 13xy − 15y2
  3. C.2x2 + 13xy + 15y2
  4. D.2x2 − 13xy + 15y2
Show the answer and explanation

Answer: D (2x2 − 13xy + 15y2)

Explanation

2x2 − 10xy − 3xy + 15y2 = 2x2 − 13xy + 15y2.