Question

Have you ever cheated in an exam?
Simplify the following expression using suitable identity (Mention the identity used)(4+7)(4+5)–(3+5)(3–5)​

Answer 1

Answer:

nope

never

Using Formula (x+a)(x+b) = x²

+(a+b)x+ab

Writing 55 as 50+5 and 45 as 50−5

⇒ (50+5)(50−5) = 50²+[5+(−5)]50+(5)(−5)

= 2500+(0)50−25

= 2475

The answer is 2475