bonjour
f(x) = 16 x² - ( 3 x - 1)²
f(x) = ( 4 x + 3 x - 1) ( 4 x - 3 x + 1)
f(x) = ( 7 x - 1) ( x - 2 )
f(1/7) = ( 7/7 - 7/7) ( 7/7 - 14/7) = 0
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bonjour
f(x) = 16 x² - ( 3 x - 1)²
f(x) = ( 4 x + 3 x - 1) ( 4 x - 3 x + 1)
f(x) = ( 7 x - 1) ( x - 2 )
f(1/7) = ( 7/7 - 7/7) ( 7/7 - 14/7) = 0