Question

Evaluate the following by using Identity-II.
(vi) (19.9)²​

Answer 1

Answer:

Identity (ll)= (a-b)²= a²-2ab+b²

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$(19.9) ^{2} = (20 - 0.1) {}^{2}$

$= (20) {}^{2} - 2(20)(0.1) + (0.1) {}^{2}$

$= 400 - 4 + 0.01$

$= 396 + 0.01$

$= 396.01 \: \: ans.$

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hope it helps you

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Answer 2

Answer:

Hi guys ☺️☺️

( 19.9 ) ^2

(20 - 0.1 ) ^ 2

( 20 ) ^2 + ( 0.1 ) ^2 - 2 × 20 × 0.1

400 + 0.01 - 4

396.01

This is your answer hope it's helpful for you