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Byju's Answer
Standard VII
Mathematics
Value of an Expression
If A = 2x2 - ...
Question
If A =
2
x
2
−
y
+
3
x
y
, B =
x
2
+
2
x
y
and C = 3y + 2xy, then find A - B + C.
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Solution
A
−
B
+
C
⇒
A
−
B
+
C
=
(
2
x
2
−
y
+
3
xy
)
−
(
x
2
+
2
xy
)
+
(
3
y
+
2
xy
)
⇒
A
−
B
+
C
=
(
2
−
1
)
x
2
+
(
3
−
2
+
2
)
xy
−
y
⇒
A
−
B
+
C
=
x
2
+
3
xy
−
y
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13
Similar questions
Q.
Question 17
Which of the following is a factor of
(
x
+
y
)
3
–
(
x
3
+
y
3
)
?
A)
x
2
+
y
2
+
2
x
y
B)
x
2
+
y
2
–
x
y
C)
x
y
2
D)
3
x
y
Q.
If
sin
A
=
x
,
cos
B
=
y
and
A
+
B
+
C
=
0
, then
x
2
+
2
x
y
sin
C
+
y
2
is equal to
Q.
a -b-c2a2a1. ) 2b b-c-a 2b -(a+b+c)2c2c c-a-b(ii) z2y+z+2x2-2(x y+ z)z+x+2y
Q.
Find the real values of
x
and
y
for which the following equation is satisfied.
(i)
(
2
+
3
i
)
x
2
−
(
3
−
2
i
)
y
=
2
x
−
3
y
+
5
i
(ii)
4
x
2
+
3
x
y
+
(
2
x
y
−
3
x
2
)
i
=
4
y
2
−
(
x
2
2
)
+
(
3
x
y
−
2
y
2
)
i
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
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