Que.4 evaluate: 65×55.
Answers
Answered by
1
Answer:
Using Formula (x+a)(x+b) = x
2
+(a+b)x+ab
Writing 55 as 50+5 and 45 as 50−5
⇒ (50+5)(50−5) = 50
2
+[5+(−5)]50+(5)(−5)
= 2500+(0)50−25
= 2475
The answer is 2475
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