Math, asked by sanjaynigam2699, 6 months ago

यूजिंग सूटेबल आईडेंटिटी evaluate 781×8 19

Answers

Answered by ashutoshanand4829

0

Answer:

the answer is 639639

Step-by-step explanation:

781=800-19

819=800+19

819*781=(800+19)(800-19)

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

(800+19)(800-19)=800^2-19^2=640000-361=639639

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