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Mathematics
Mathematics
Problem
Let
f
(
x
)
=
x
2
−
9
x
2
−
4
x
+
3
f(x)=\dfrac{x^{2}-9}{x^{2}-4x+3}
f
(
x
)
=
x
2
−
4
x
+
3
x
2
−
9
, where the function is defined for all real
x
x
x
except where the denominator is zero. Which set lists all points of discontinuity of
f
f
f
? a)
{
1
}
\{1\}
{
1
}
b)
{
−
3
,
1
,
3
}
\{-3,1,3\}
{
−
3
,
1
,
3
}
c)
{
1
,
3
}
\{1,3\}
{
1
,
3
}
d)
{
1
,
−
1
,
3
}
\{1,-1,3\}
{
1
,
−
1
,
3
}
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