1.

Expand using appropriate identities:203 × 197

Answer»

203 × 197 

= (200 + 3)(200 – 3)

Comparing (a + b) (a – b) we have a = 200, b = 3

(a + b)(a – b) = a2 – b2

(200 + 3)(200 – 3) = 2002 – 32

203 × 197 = 40000 – 9

203 × 197 = 39991



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