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Byju's Answer
Standard XII
Mathematics
Sum of Coefficients of All Terms
If 3 - 13 +...
Question
If
(
3
−
1
)
3
+
(
3
)
3
(
3
−
1
)
2
+
3
2
−
x
=
40
, then
x
=
?
Open in App
Solution
(
3
−
1
)
3
+
(
3
)
3
(
3
−
1
)
2
+
(
3
)
2
−
x
=
40
(
2
)
3
+
27
(
2
)
2
+
9
−
x
=
40
8
+
27
4
+
9
−
x
=
40
35
13
−
x
=
40
1
By Cross-multiplying , we get
35
=
40
(
13
−
x
)
35
=
520
−
40
x
⇒
40
x
=
520
−
35
40
x
=
485
x
=
485
40
=
97
8
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