Evaluate the following by using suitable identities: 83×77
Answers
Answered by
3
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.
Answered by
7
Answer:
6391
Step-by-step explanation:
83 X 77
= (80 + 3) X (70 + 7)
= 80x70 + 80x7 + 3x70 + 3x7
= 5600 + 560 + 210 + 21
= 6391
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