Question

Using suitable identity, evaluate (1) 781 * 819

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Answer 1

Answer:

639639

Step-by-step explanation:

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Answer 2

Answer:

(a+b)(a-b)=a^2-b^2

(800-19)(800+19)=800^2-19^2

=640000-361=639,639

Step-by-step explanation:

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