Using identities, evaluate.
(a) 77 × 83
Answers
Answered by
2
Answer:
6391
Step-by-step explanation:
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Answered by
1
Answer:
6391
Step-by-step explanation:
77 = 80-3
83= 80+3
So we simply multiply 80 by 80 then subtract 9 from this
80*80 = 6400
3*3 = 9
6400-9 = 6391
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