by using a suitable identity,evaluate the following:-
1. 206×205
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Answered by
22
the answer of the question is 42230
Answered by
64
206 × 205
=> (200 + 6 ) ( 200 + 5)
(x+a) (x+b) = x^2 + (a+b)x + ab
=> (200)^2 + (5+6) × 200 + 5 × 6
=> 40000 + 2200 + 30
=> 42230
=> (200 + 6 ) ( 200 + 5)
(x+a) (x+b) = x^2 + (a+b)x + ab
=> (200)^2 + (5+6) × 200 + 5 × 6
=> 40000 + 2200 + 30
=> 42230
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