Question

Which of the following is the discriminant of the polynomial below?

x2 + 4x +5
A. 5
B. 4
C.-4
D. -16

Answer 1

Answer: -4

Explanation:

Answer 2

-1

Explanation:

The formula for D/4 is b'^2-ac (where b' = 4/2=2, a=1, c=5). When we use the special discriminant (D/4) we get D/4 = (2)^2-1*5 = 4-5=-1.

Hope this helps!