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Byju's Answer
Standard VIII
Mathematics
Addition and Subtraction of Algebraic Expression
What must be ...
Question
What must be subtracted from
a
2
b
+
6
a
2
b
2
−
7
a
b
+
4
to get
−
7
a
2
b
2
+
2
a
3
b
+
6
a
b
−
1
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Solution
Let
x
be the expression subtracted from
a
2
b
+
6
a
2
b
2
−
7
a
b
+
4
to get
−
7
a
2
b
2
+
2
a
3
b
+
6
a
b
−
1
⇒
a
2
b
+
6
a
2
b
2
−
7
a
b
+
4
−
x
=
−
7
a
2
b
2
+
2
a
3
b
+
6
a
b
−
1
⇒
−
x
=
−
7
a
2
b
2
+
2
a
3
b
+
6
a
b
−
1
−
(
a
2
b
+
6
a
2
b
2
−
7
a
b
+
4
)
⇒
−
x
=
−
7
a
2
b
2
+
2
a
3
b
+
6
a
b
−
1
−
a
2
b
−
6
a
2
b
2
+
7
a
b
−
4
⇒
−
x
=
−
13
a
2
b
2
+
2
a
3
b
−
a
2
b
+
13
a
b
−
5
∴
x
=
13
a
2
b
2
−
2
a
3
b
+
a
2
b
−
13
a
b
+
5
∴
,
13
a
2
b
2
−
2
a
3
b
+
a
2
b
−
13
a
b
+
5
must be subtracted.
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