Given: (343 × 343 + 326 × 326 – 2 × 343 × 326) Concept used: (a−b)2=a2+b2−2×a×b Calculation: (343×343+326×326–2×343×326) The given question is of the form: a2+b2−2×a×b Here, a = 343 and b = 326 The value of the given expression = (a−b)2 ⇒ (a−b)2 = (343−326)2=(17)2 ⇒ (a−b)2 = 289 ∴ The value of the expression is 289.