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Mathematics
Problem
The value of the expression
x
2
+
2
b
x
+
c
x^2 + 2bx + c
x
2
+
2
b
x
+
c
will be positive for all real
x
x
x
if - (A)
b
2
−
4
c
>
0
b^2 - 4c > 0
b
2
−
4
c
>
0
(B)
b
2
−
4
c
<
0
b^2 - 4c < 0
b
2
−
4
c
<
0
(C)
c
2
<
b
c^2 < b
c
2
<
b
(D)
b
2
<
c
b^2 < c
b
2
<
c
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