expand the formula ( X + 1) ³
Answers
Answered by
4
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Answered by
0
Step-by-step explanation:
Explanation:
note that
(
x
+
a
)
3
=
x
3
+
(
a
+
a
+
a
)
x
2
+
(
a
.
a
+
a
.
a
+
a
.
a
)
x
+
a
3
(
x
−
1
)
3
→
a
=
−
1
⇒
(
x
−
1
)
3
=
x
3
+
(
−
1
−
1
−
1
)
x
2
+
(
1
+
1
+
1
)
x
+
(
−
1
)
3
=
x
3
−
3
x
2
+
3
x
−
1
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