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Mathematics
Problem
Explain in one or two sentences why
lim
x
→
−
1
(
4
x
3
+
5
)
\displaystyle \lim_{x\to -1}\bigl(4x^3+5\bigr)
x
→
−
1
lim
(
4
x
3
+
5
)
can be obtained simply by substituting
x
=
−
1
x=-1
x
=
−
1
.
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