Math, asked by shubhi374, 5 months ago

Use the formula (a+b) (a-b) =a²-b²to find the value of 21×19

Answers

Answered by jahnavi7978

0

Hope the answer was helpful .

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Answered by lalage

0

Step-by-step explanation:

21×19

(20+1)(20-1) (USE THE GIVEN IDENTITY)

(20)^2-(1)^2

400-1

399

I gave your answer please mark me as brainliest

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