1.

Evaluate the following by using suitable identities: 83×77​

Answer»

Answer:

6391

Step-by-step explanation:

The given product 83×77 can be rewritten as (80+3)×(80−3) and we SOLVE it as follows:

(80+3)(80−3)

=(80)

2

−(3)

2

(∵a

2

−b

2

=(a+b)(a−b))

=6400−9

=6391

Hence, 83×77=6391.


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