Solve x^2 – 3x – 4 = 0.  Pick
A) (9,2)
B) (7,3)
C) (1,3)
D) (-1,4)
E) (2,5)
This one factors easily:   x^2 – 3x – 4 = 0   (x + 1)(x – 4) = 0   x + 1 = 0 or x – 4 = 0   x = –1 or x = 4   The solution is x = –1, 4   Ans: (-1,4)
<result>D</result>
Solve x^2 – 3x – 4 = 0.