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Mathematics
Problem
Which of the following functions is continuous on the entire real number line
(
−
∞
,
∞
)
(-\infty,\infty)
(
−
∞
,
∞
)
? a)
f
(
x
)
=
x
+
4
f(x)=\sqrt{x+4}
f
(
x
)
=
x
+
4
b)
f
(
x
)
=
ln
x
f(x)=\ln x
f
(
x
)
=
ln
x
c)
f
(
x
)
=
x
3
−
2
x
+
5
f(x)=x^{3}-2x+5
f
(
x
)
=
x
3
−
2
x
+
5
d)
f
(
x
)
=
1
x
−
2
f(x)=\dfrac{1}{x-2}
f
(
x
)
=
x
−
2
1
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