(197 × 203) = ? A. 39991 B. 39999 C. 40009 D. 40001

1.	(197 × 203) = ? A. 39991 B. 39999 C. 40009 D. 40001
Answer» We can write following problem such as, (197 × 203) = (200 – 3)(200 + 3) From the formula, (a +b)(a – b) = a²– b² We get, (200 – 3)(200 + 3) = 200² – 3² = 40000 – 9 = 39991.

Answer»

We can write following problem such as,

(197 × 203) = (200 – 3)(200 + 3)

From the formula, (a +b)(a – b) = a²– b²

We get,

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

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