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1 . x2-4x+3=0

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Answer: Option C

Explanation:

দেওয়া আছে, x^{2} - 4 x + 3 = 0 x^{2} - 3 x - x + 3 = 0 x (x - 3) - 1 (x - 3) = 0 (x - 3) (x - 1) = 0 অতএব, x - 3 = 0 x = 3 এবং x - 1 = 0 x = 1 এখন x = 3 হলে {(x - 2)}^{2} = {(3 - 2)}^{2} = 1^{2} = 1 আবার x = 1 হলে {(x - 2)}^{2} = {(1 - 2)}^{2} = - 1^{2} = 1