bonjour
B = ( 4 n + 1 )² + 9 n² - 28 n + 3
B = 16 n² + 8 n + 1 + 9 n² - 28 n + 3
B = 25 n² - 20 n + 4
B = ( 5 n - 2 )²
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bonjour
B = ( 4 n + 1 )² + 9 n² - 28 n + 3
B = 16 n² + 8 n + 1 + 9 n² - 28 n + 3
B = 25 n² - 20 n + 4
B = ( 5 n - 2 )²