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Byju's Answer
Standard VII
Mathematics
Expression Formation
If A=5x2+3x...
Question
If
A
=
5
x
2
+
3
x
2
−
4
x
+
1
,
B
=
3
x
3
+
5
x
2
+
3
x
−
8
and
C
=
6
x
3
−
4
x
2
−
7
x
+
3
find.
(
A
+
B
)
=
C
.
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Solution
A
=
5
x
3
+
3
x
2
−
4
x
+
1
B
=
3
x
3
+
5
x
2
+
3
x
−
8
C
=
6
x
3
−
4
x
2
−
7
x
+
3
(A+B) - C
⇒
(
5
x
3
+
3
x
2
+
4
x
+
1
+
3
x
3
+
5
x
2
+
3
x
−
8
)
−
(
6
x
3
−
4
x
2
+
7
x
+
3
)
⇒
8
x
3
+
18
x
2
+
7
x
−
7
−
6
x
3
+
4
x
2
+
7
x
−
3
⇒
2
x
3
+
12
x
2
+
14
x
−
10
Suggest Corrections
6
Similar questions
Q.
If
A
=
3
x
2
–
4
x
+
1
,
B
=
5
x
2
+
3
x
–
8
and,
C
=
4
x
2
–
7
x
+
3
, then find:
(i) (A + B) – C
(ii) B + C – A
(iii) A + B + C
Q.
Question 68 (i)
If
A
=
3
x
2
−
4
x
+
1
,
B
=
5
x
2
+
3
x
−
8
a
n
d
C
=
4
x
2
−
7
x
+
3
, then find
(A + B) - C
Q.
If
A
=
3
x
2
−
4
x
+
1
,
B
=
5
x
2
+
3
x
−
8
and
C
=
4
x
2
−
7
x
+
3
, then find:
(i)
(
A
+
B
)
−
C
(ii)
B
+
C
−
A
(iii)
A
+
B
+
C
Q.
If
A
=
2
y
2
+
3
x
−
x
2
,
B
=
3
x
2
−
y
2
and
C
=
5
x
2
−
3
x
y
then find
B
+
C
Q.
Simplify:
12x − [3x
3
+ 5x
2
− {7x
2
− (4 − 3x − x
3
) + 6x
3
} − 3x]
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