Question

7.3² - 2.7² is equal to *

45

46

48

49​

Answer 1

$\sf{Answer}$

Given :-

7.3² - 2.7² is equal to 

Formula to know :-

a² - b² = ( a + b) ( a - b )

Solution:-

By using above formula Lets solve

7.3² - 2.7²

$\implies$a² - b² = ( a + b) ( a - b )

$\implies$ 7.3² - 2.7² = ( 7.3 + 2.7 ) ( 7.3 - 2.7 )

$\implies$7.3² - 2.7² = (10 ) ( 4. 6)

$\implies$7.3² - 2.7² = 46 / 10 × 10

7.3² - 2.7² = 46

Hence the answer is option B

__________________________

Know more Algebraic Identities :-

a + b)² = a² + b² + 2ab

( a - b )² = a² + b² - 2ab

( a + b )² + ( a - b)² = 2a² + 2b²

( a + b )² - ( a - b)² = 4ab

( a + b + c )² = a² + b² + c² + 2ab + 2bc + 2ca

a² + b² = ( a + b)² - 2ab

(a + b )³ = a³ + b³ + 3ab ( a + b)

( a - b)³ = a³ - b³ - 3ab ( a - b)

If a + b + c = 0 then a³ + b³ + c³ = 3abc

Answer 2

Answer:

46

Step-by-step explanation:

a² - b² = ( a + b) ( a - b )

Solution:-

By using above formula Lets solve

7.3² - 2.7²

\implies⟹ a² - b² = ( a + b) ( a - b )

\implies⟹ 7.3² - 2.7² = ( 7.3 + 2.7 ) ( 7.3 - 2.7 )

\implies⟹ 7.3² - 2.7² = (10 ) ( 4. 6)

\implies⟹ 7.3² - 2.7² = 46 / 10 × 10

7.3² - 2.7² = 46

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