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Which of the following equations has its roots as 4 and -5?

Mathematics
WAEC 1997

Which of the following equations has its roots as 4 and -5?

  • A. x2 + 4x - 20 = 0
  • B. x2 + x + 20 = 0
  • C. x2 - x + 20 = 0
  • D. x2 + x - 20 = 0
  • E. x2 - x - 20 = 0
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Correct Answer: Option D
Explanation

(x - 4)(x + 5) = 0
x\(^2\) + 5x - 4x - 20 = 0
x\(^2\) + x - 20 = 0

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