Question

Evaluate ((7.8)2-(2.2)2)

Answer 1

Answer :

56

Step-by-step explanation :

( 7.8 )² - ( 2.2 )²

We will evaluate this, by using an identity :

a² - b² = ( a + b )( a - b )

So, Here we have ,

a = 7.8 and b = 2.2

Solution ;

( 7.8 )² - ( 2.2 )²

⇒ ( 7.8 + 2.2 ) ( 7.8 - 2.2 )

⇒ 10 × 5.6

⇒ 56

Hence, the answer is 56.

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Answer 2

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