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Byju's Answer
Standard VII
Mathematics
Addition of Algebraic Expressions
How [x+y]3=x3...
Question
How [x+y]
3
=x
3
+y
3
+3xy[x+y] can become x
3
+y
3
=[x+y]
3
-3xy[x+y]
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Solution
Dear student,
(
x
+
y
)
3
=
x
3
+
y
3
+
3
x
y
(
x
+
y
)
⇒
(
x
+
y
)
3
-
3
x
y
(
x
+
y
)
=
x
3
+
y
3
-
-
[
t
a
k
i
n
g
3
x
y
(
x
+
y
)
t
o
l
e
f
t
s
i
d
e
]
o
r
x
3
+
y
3
=
(
x
+
y
)
3
-
3
x
y
(
x
+
y
)
Regards
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0
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