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