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Byju's Answer
Standard VII
Mathematics
Substitution
The number of...
Question
The number of non zero integers x such that -10<x<15 for which 3x
3
+7x
2
is a square of an integer is
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Solution
Let
A
be
the
that
required
number
A
.
T
.
Q
3
x
3
+
7
x
2
=
A
2
A
2
=
x
2
3
x
+
7
A
=
x
3
x
+
7
It
is
given
that
-
10
<
x
<
15
For
-
10
<
x
≤
-
1
A
will
not
be
real
.
For
x
=
0
,
it
will
violate
questions
condition
So
we
left
with
1
≤
x
<
15
So
,
the
number
of
non
zero
integers
x
such
that
3
x
3
+
7
x
2
is
a
square
of
an
integer
is
14
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