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UI Post-UTME Mathematics 2018 (Model questions) Question 45

Question 45

Quadratic Equations

A street trader spent ₦550 on x articles, each costs ₦(2x − 28). Find x

  1. A.30
  2. B.20
  3. C.27
  4. D.25
Show the answer and explanation

Answer: D (25)

Explanation

x(2x − 28) = 550 gives x² − 14x − 275 = 0, (x − 25)(x + 11) = 0, so x = 25.