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+1 vote
1.1k views
in Algebraic Expressions by (31.2k points)
closed by

(197 × 203) = ? 

A. 39991 

B. 39999 

C. 40009 

D. 40001

1 Answer

+1 vote
by (30.8k points)
selected by
 
Best answer

We can write following problem such as, 

(197 × 203) = (200 – 3)(200 + 3) 

From the formula, (a +b)(a – b) = a2 – b

We get, 

(200 – 3)(200 + 3) = 2002 – 32 = 40000 – 9 = 39991.

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