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Byju's Answer
Standard VII
Mathematics
Multiplication of a Monomial by a Monomial
2x2yz×5xy2z2=
Question
2
x
2
y
z
×
5
x
y
2
z
2
= ___________________
A
10
x
2
y
2
z
2
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B
7
x
2
y
2
z
2
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C
15
x
3
y
3
z
3
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D
10
x
3
y
3
z
3
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Solution
The correct option is
D
10
x
3
y
3
z
3
2
x
2
y
z
×
5
x
y
2
z
2
=
(
2
×
5
)
(
x
2
×
x
)
(
y
×
y
2
)
(
z
×
z
2
)
=
10
x
3
y
3
z
3
[
∵
a
m
×
a
n
=
a
(
m
+
n
)
]
Suggest Corrections
0
Similar questions
Q.
If
Z
1
,
Z
2
∈
C, which of the following is true?
Q.
Prove that
|
z
1
|
+
|
z
2
|
=
∣
∣
∣
1
2
(
z
1
+
z
2
)
+
√
z
1
z
2
∣
∣
∣
+
∣
∣
∣
1
2
(
z
1
+
z
2
)
−
√
z
1
z
2
∣
∣
∣
.
Q.
If z is a complex number
,
then
(a)
z
2
>
z
2
(b)
z
2
=
z
2
(c)
z
2
<
z
2
(d)
z
2
≥
z
2
Q.
|z
1
+ z
2
| = |z
1
| + |z
2
| is possible if
(a)
z
2
=
z
¯
1
(b)
z
2
=
1
z
1
(c) arg (z
1
) = arg (z
2
)
(d) |z
1
| = |z
2
|
Q.
If
z
1
and
z
2
are two complex numbers, then prove that
|
z
1
|
+
|
z
2
|
=
∣
∣
∣
z
1
+
z
2
2
+
√
z
1
z
2
∣
∣
∣
+
∣
∣
∣
z
1
+
z
2
2
−
√
z
1
z
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∣
∣
∣
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