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Byju's Answer
Standard VIII
Mathematics
Application of Algebraic Identities
Using an iden...
Question
Using an identity, find the value of
12.1
2
−
7.9
2
.
A
80
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B
84
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C
88
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D
86
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Solution
The correct option is
B
84
Using the identity,
a
2
−
b
2
=
(
a
−
b
)
(
a
+
b
)
12.1
2
−
7.9
2
=
(
12.1
+
7.9
)
(
12.1
−
7.9
)
=
20.0
×
4.2
=
84.0
=
84
Suggest Corrections
11
Similar questions
Q.
Using suitable algebraic identities to find the value of
12.1
2
−
7.9
2
.
Q.
Using identities, evaluate
12.1
2
−
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.
Q.
Using
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−
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a
+
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−
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Find
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−
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.
Q.
Using
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−
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2
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