Math, asked by ratannakum1327, 10 months ago

21x19 using (a+b)(a-b)=a2+b2 formula

Answers

Answered by shubhdeepakrandhawa

2

Answer:

21×19

(20+1)(20-1)

(a+b)(a-b)=a2-b2

(20)^2-(1)^2

40-1

39

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