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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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