Mathematics

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

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
Correct Answer: Option D
Explanation

(x – 4)(x + 5) = 0
x(^2) + 5x – 4x – 20 = 0
x(^2) + x – 20 = 0