Solve the equation 5x2 – 4x – 1 = 0
-
A.
-1, 1/5 -
B.
-1, -1/5 -
C.
1, 1/5 -
D.
1, -1/5 -
E.
-1, 5
Correct Answer: Option D
Explanation
5x2 – 4x – 1 = 0
5x2 5x + x -1 = 0
5x(x – 1) + (x – 1) = 0
(5x + 1)(x -1) = 0
x = -1/5 or 1 = 0
5x2 – 4x – 1 = 0
5x2 5x + x -1 = 0
5x(x – 1) + (x – 1) = 0
(5x + 1)(x -1) = 0
x = -1/5 or 1 = 0