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Byju's Answer
Standard VII
Mathematics
(a + b)^2 Expansion and Visualisation
Solve | 12x...
Question
Solve
∣
∣
∣
12
x
4
x
2
+
9
∣
∣
∣
≤
1.
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Solution
∣
∣
∣
12
x
4
x
2
+
9
∣
∣
∣
≤
1
⇒
−
1
≤
12
x
4
x
2
+
9
≤
1
since
4
x
2
+
9
is
+
v
e
for all real
x
We can multiply the inequality by
4
x
2
+
9
∴
−
(
4
x
2
+
9
)
≤
12
x
≤
(
4
x
2
+
9
)
⇒
(
2
x
+
3
)
2
≥
0
and
(
2
x
−
3
)
2
≥
0
Above is true for all real values of
x
being perfect square
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0
Similar questions
Q.
Solve
(
4
x
+
1
)
2
+
(
2
x
+
3
)
2
4
x
2
+
12
x
+
9
=
61
36
Q.
Solve the following equation:
(
4
x
+
1
)
2
+
(
2
x
+
3
)
2
4
x
2
+
12
x
+
9
=
61
36
Q.
(a) Find all integral values of
x
for which
(
5
x
−
1
)
<
(
x
+
1
)
2
<
(
7
x
−
3
)
I
I
I
I
I
I
.
(b)
S
o
l
v
e
∣
∣
∣
12
x
4
x
2
+
9
∣
∣
∣
≤
1
.
Q.
Solve the following equation:
log
(
2
x
+
3
)
(
6
x
2
+
23
x
+
21
)
=
4
−
log
(
3
x
+
7
)
(
4
x
2
+
12
x
+
9
)
. Find
−
4
x
.
Q.
Solve: (splitting middle term)
7
−
12
x
−
4
x
2
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Standard VII Mathematics
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