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Mathematics
Mathematics
Problem
For which one of the following values of
k
k
k
is the function
y
=
log
2
(
x
2
−
k
x
+
4
)
y=\log_{2}(x^{2}-kx+4)
y
=
lo
g
2
(
x
2
−
k
x
+
4
)
defined for every real
x
x
x
? a)
k
=
4
k=4
k
=
4
b)
k
=
6
k=6
k
=
6
c)
k
=
2
k=2
k
=
2
d)
k
=
−
4
k=-4
k
=
−
4
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