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Byju's Answer
Standard VII
Mathematics
(a-b)^2 Expansion and Visualisation
Out of a grou...
Question
Out of a group of swans,
7
2
times the square root of the number is playing on the shore of a tank. The two remaining ones are playing with the amorous fight, in the water. What is the total number of swans?
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Solution
Let the total number of swans be
x
Now,
x
=
7
2
√
x
+
2
⇒
x
−
7
2
√
x
−
2
=
0
Let
√
x
=
y
∴
y
2
=
x
⇒
x
−
7
2
√
x
−
2
=
0
becomes
⇒
y
2
−
7
2
y
−
2
=
0
⇒
2
y
2
−
7
y
−
4
=
0
⇒
2
y
2
−
8
y
+
y
−
4
=
0
⇒
2
y
(
y
−
4
)
+
1
(
y
−
4
)
=
0
⇒
(
2
y
+
1
)
(
y
−
4
)
=
0
⇒
2
y
+
1
=
0
,
y
−
4
=
0
⇒
2
y
=
−
1
,
y
=
4
⇒
y
=
−
1
2
,
4
⇒
√
x
=
−
1
2
,
4
where
y
=
√
x
⇒
√
x
=
4
and
x
=
1
4
swans are meaningless
∴
x
=
16
by squaring
Hence, the total number of swans is
16
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