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Mathematics
Problem
For the quadratic function
f
k
(
x
)
=
x
2
+
k
x
+
4
f_k(x)=x^{2}+kx+4
f
k
(
x
)
=
x
2
+
k
x
+
4
(
k
∈
R
k\in\mathbb R
k
∈
R
), the minimum value equals
1
1
1
. Which of the following describes all real values of
k
k
k
for which this occurs? a)
k
=
±
3
k=\pm \sqrt3
k
=
±
3
b)
k
=
±
2
3
k=\pm 2\sqrt3
k
=
±
2
3
c)
k
=
−
2
k=-2
k
=
−
2
d) No real value of
k
k
k
satisfies the condition
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