bonsoir
f(x) = ( 3 x - 2)² - ( 3 x - 2) ( 5 x - 4)
f(x) = 9 x² - 12 x + 4 - ( 15 x² - 12 x - 10 x + 8)
f(x) = 9 x² - 12 x + 4 - 15 x² + 12 x + 10 x - 8
f(x) = - 6 x² + 10 x - 4
f(x) = ( 3 x - 2) ( 3 x - 2 - 5 x + 4)
f(x) = ( 3 x - 2) ( - 2 x + 2)
g(x) = - 6 x² + 10 x - 4
g(0) = - 4
g( 2/3) = - 6 ( 2/3)² + 10 ( 2/3) - 4
g( 2/3 ) - 6 ( 4/9) + 20/3 - 4
g( 2/3) = - 24/9 + 20/3 - 4
g( 2/3) = - 24/9 + 60/9 - 36/9
g(2/3) = 0
antécédents de 0 = réponse au dessus
