Question

Find the product using identity 49×51​

Answer 1

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Answer 2

49=(50-1) 51=(50+1)

49×51 [using (x+a) (x-b)=x²-(a-b)-ab]

=(50-1) (50+1)

=(50)²-(1-1)-1×1

=2500-0-1

=2500-1

=2499

2499 is your answer.

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