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bonjour

f (x) = ( x - 1 ) ( 2 x - 5 )

f (x) = 2 x² - 5 x - 2 x + 5

f (x) = 2 x² - 7 x + 5

f ( 0 ) = 0 - 0 + 5 = 5

f ( 1) =  2*1² - 7*1 + 5 = 2 - 7 + 5 =  0

f (  2) = 2 *2² - 7*2 + 5 = 8 - 14 + 5 = - 1

on remplace simplement x par sa valeur  

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