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Byju's Answer
Standard VIII
Mathematics
Product of (x+y) (x-y)
Question 6vii...
Question
Question 6(vii)
Using identities, evaluate:
78
×
82
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Solution
78
×
82
=
(
80
−
2
)
×
(
80
+
2
)
=
(
80
)
2
−
(
2
)
2
[
U
s
i
n
g
i
d
e
n
t
i
t
y
(
a
−
b
)
(
a
+
b
)
=
a
2
−
b
2
]
=
6400
−
4
=
6396
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Product of (x+y) (x-y)
Standard VIII Mathematics
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