Question

Evaluate:- (7.8)^2-(2.2)^2/5.6​

Answer 1

Answer:

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 )/5.6

⇒ 10 × 5.6/5.6

=>10

Step-by-step explanation:

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